Meet Adam, 34, who lives with his two girlfriends, Brooke, 26, and Jane, 25.
Adam and Brooke have just given birth to a baby boy, Danté - and the 'throuple' hope to raise their child together.
The trio - who share a super-kingsize bed and take it in turns to have romantic date nights together - insist that they can provide a loving family environment for their newborn.
Adam says: 'We're just like any other family. Except in ours, there'll be one dad and two mums who live under the same roof - and there'll be nothing but love for our children.
Brooke, who already has a five-year-old son, Oliver from a previous relationship who lives with the trio, adds: 'With two partners, I'll never have to leave my kids with someone I don't trust.'
'Danté and Oliver will grow up seeing Adam, Jane and I being affectionate and caring for each other. I think that's amazing.'
When he was growing up, Adam didn't have much success with women.
He says: 'At high school, I was voted the least likely to ever get a girlfriend. I believed that no girl would ever want me so I withdrew into myself. I became a nerd who stayed at home all day.'
But at the age of 25 whilst he was working as a janitor.
'I started reading about how you can use psychology to make yourself more attractive.
Adam became so knowledgeable at seducing girls that he started a career as a coach.
Adam adds: 'After being a nerdy loner all my life, I was suddenly leading this Hugh Hefner lifestyle.
'It felt like I could get any beautiful woman that I wanted. At one point, I was dating fourteen girls at the same time - it was crazy!'
But Adam grew tired of dating multiple women and yearned for the commitment of a stable relationship.
'Dating all of these girls became very stressful and boring - I realised that really I wanted to fall in love and settle down.'
In 2007, Adam met Alexandra*, who was five years his junior and fell in love with her.
After dating for a year, they got married and started their new life together where Alexandra came from.
Adam explains: 'I was madly in love with Alexandra and our life together was perfect.
'We had a very traditional, monogamous marriage. We were like any other normal, happy couple.'
But after three years together, things between the couple began to sour when Alexandra still wasn't ready to have children with Adam.
He says: 'I wanted to have kids as soon as possible but Alexandra had no interest in having any yet.
'The baby issue started causing other problems in our relationship. But Alexandra and I still loved each other and we didn't want to get a divorce.'
In a bid to save their marriage, Adam and Alexandra decided to give 'polyamory' a go.
He explains: 'After many discussions, we chose to 'open up' our relationship and start seeing other people as well as each other.
'Alexandra and I figured that if we had a polyamorous marriage, then perhaps we would have a better chance of staying together.
'It brought the two of us closer together. We'd sit on the sofa and talk about the fantastic times we were having with different people.
'I even met and became mates with some of the men Alexandra was dating. It was really good bonding for us.’
But things got complicated between the pair when Alexandra suggested that Adam get with one of their mutual friends, Brooke.
'Alexandra and I were really close friends with a woman called Brooke.
'By 2012, I had started spending a lot more time with Brooke - playing videos games and going on nights out together.
'Soon she'd become one of my best friends. One night, Alexandra and I were chatting about our other partners and she suggested that I date Brooke.
'Alexandra thought we would make a great match and I agreed. I had always thought Brooke fancied women more that men but Alexandra encouraged me to make a move on her.'
Adam approached Brooke about the idea and the pair first had a moment together during a trip together.
Brooke, who worked as a bartender at the time, says: 'I had always liked Adam.
'We had a lot in common and from the moment we met, there was an instant chemistry between us. Over time, our friendship grew into something deeper.'
He explains: 'It soon became clear that Brooke and I were in love. Alexandra still didn't want children any time soon and she'd also begun dating a guy that she really liked too.
'Alexandra and I had a long chat and in late 2012, we decided to amicably separate. She moved into her own place with the man she was dating and I moved in with Brooke and her son, Oliver.'
Although Adam and Brooke were thrilled to be together finally, neither of them wanted to have a completely monogamous relationship.
Adam says: 'It was amazing to be living with Brooke now and I loved hanging out with her and her son, Oliver.
'But after trying marriage out with Alexandra, I didn't want to limit myself to being with just one person ever again.
'I loved the polyamorous lifestyle because it's okay to date someone else if one partner can't provide exactly what you need at that time.'
'I really pushed for us to have an open relationship too. So Adam and I decided to work as a team and find girls together.
'After that, most of the time, Brooke and I went with women together.
'I made sure to tell Brooke about it before and we were texting each other throughout which was kind of funny.'
Adam and Brooke continued having casual arrangements together but were also looking for a third woman to permanently join their relationship.
Then in April 2013, the twosome met photographer, Jane, in a nightclub and immediately hit it off with her.
Adam says: 'I knew Jane was unique from the moment we met her. The three of us clicked as soon as we started chatting.
'We left the nightclub to go grab some dinner with Jane and then Brooke and I took her back to our house for a few drinks.
Brooke adds: 'There was an immediate spark with Jane - she was super fun and very intelligent.
'I knew that sex could have happened that first night but I really liked Jane and I didn't want to push her into anything. I wanted to see whether this could be something more.'
Jane says: 'I loved how there was no pressure to do anything when I first met Adam and Brooke.
'We just hung out, spoke and flirted at their house. I had never experimented with such relationships but with Adam and Brooke, it felt so natural. They were two awesome people.
'It's like imagine you meet your soul mate. Now multiply that by two! It's twice the love.'
Adam, Brooke and Jane met for dinner again soon after and on their third date, the inevitable happened. They kept meeting up with each other and fell in love.
Adam says: 'Jane worked most of the time so we took our relationship slowly at first, meeting up with her whenever we could.
'But things really blossomed between the three of us. We had so much fun with Jane and we were able to have really deep conversations with her.
As their relationship became more serious, Adam and Brooke even introduced Jane into Oliver's life.
Brooke says: 'Oliver loved Jane from the get-go. She has kind of become my son's favourite person, which was a bit heart-breaking for me initially!
Jane has taken on the role of being Oliver's friend, like a cool aunt to him. I knew that we could all be a happy family together.'
Jane adds: 'With Oliver, I am an adult who has authority but he also views me as a cool, older friend - someone who can cut him some slack and bend the rules for him a little.
'When I hang out with Oliver, I will let him ride in the front seat next to me so he feels more like a grown up, or I will let him have ice cream before dinner.
'I hope to be the adult who he can trust with the secrets that he might not feel comfortable sharing with Brooke or Adam'
In early 2014, Brooke, Adam and her son moved to Los Angeles to be nearer to Jane. A few months later, they all bought a house that they could all live in together.
After a year of living as a trio, Adam and Brooke just gave birth to a baby boy, Dante in February and they hope to raise him together with Jane. Adam and Brooke strongly believe that three parents are better than two.
Brooke explains: 'What's the difference between explaining to your kid that they have a mum and a dad or that they have three parents that love him?
'I'm so protective of my children. I feel so lucky that Oliver and Dante will have two other parents who immediately care for him. That means so much to me.
'Dante and Oliver will grow up seeing what he sees - I can only hope he knows how much love he's surrounded by with me, Adam and Jane around.
Adam adds: 'Half of all marriages now end in divorce so most kids end up having more than one mum and one dad anyway.
'Therefore, I don't think there's any problem with raising our children with three parents.
'It's also easier with three parents because usually, there's an extra adult around who can look after the child.
'We've been discussing what our kid should call Jane - we like the idea of her having a title because she's just as important to his upbringing.
There may even be more babies joining the family.
Jane says: 'I will have kids in a few years too. Caring for Dante has been good practice. And I know Brooke will be there for me when I'm pregnant.'
The three insist that their relationship is like any other normal couple's.
Adam says: 'We are just like any typical family. We wake up in the morning - Brooke will go downstairs to cook breakfast and Jane will make fresh juice for everybody.
'Then we'll sit down at the table and eat together before I head off to work.
Jane adds: 'Brooke goes from a nap after breakfast as she's tired after looking after the newborn all night. I tidy up the house while watching Dante. When Brooke wakes up, I go to the office.'
Brooke says: 'I'm more of a family person than a work person so I'm happy to stay at home taking care of the kids. I look after Oliver during the day too and take him to school.
'In the evenings when everyone has returned from work, Jane and I will play video games and hang out with Oliver and Dante whilst Adam cooks dinner.
'We try to wind things down in our house by 8pm and we'll all head off to bed soon after.'
Jane adds: 'We have a California king size bed for all three of us because a normal double bed is not enough.
'We all have separate blankets because it's difficult with one sheet. It can get insanely warm and sweaty sleeping in one bed together.'
Adam, Brooke and Jane say that time management is crucial to the success of their relationship.
Brooke explains: 'We have to make sure everyone gets time together so every pair has a set date night.
'For example, Jane and Adam will go to an art gallery date together on Tuesday and then Jane and I will have a romantic evening on Thursday.
'On our date nights, Jane and I like to cuddle up and watch a movie. We are a lot more sensual.'
Adam, Brooke and Jane are also open to the possibility of adding a permanent, fourth partner to their throuple.
Brooke says: 'We are committed to each other. But we would be open to adding another person if we met another girl who we liked and fitted into our lifestyle.
'It's not something we're concerned about at the moment, you can't instantly introduce someone to your life.
'In the same way that it's hard to find one person to commit your life to - there's three of us who have to agree to the next person.’
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