'I heard sometimes they cry...' 21-year-old Mormon Teenage Newlyweds star shares fears about his wedding night with his bride, 18, admitting 'sex is a big mystery' to him

A 21-year-old groom agonizes over losing his virginity to his 18-year-old bride in a preview for a new series about young married couples. 

George, 21, from Riverton, Utah, is one of several stars of FYI's latest series Teenage Newlyweds, which follows him and his bride, 18-year-old Halie from Mesa, Arizona, in the lead up to and early days of their marriage.

In a clip for the debut episode, which airs tonight, George opens up to his friend about 'being intimate' with Halie for the first time as they share a drive, saying that 'sex is a big mystery'.

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Nerves: 21-year-old George from Riverton, Utah, talks about his worries over his wedding night with his bride Halie, 18, from Mesa, Arizona, in a preview clip for FYI show Teenage Newlyweds, which debuts tonight

Talking it out: George talks to his friend during a drive about how he heard that girls 'sometimes' cry after the first time

Young love: Halie, 18, from Mesa, Arizona, pictured on her wedding day with George, 21, decided to marry her husband after spending just two weeks together

'We haven't talked in depth. I'm kind of nervous for that,' the young man explains to his pal.

He adds that: 'The only real sex talks I've had is with my friend who's also getting married who's never had sex.'

George met his bride-to-be during a mission for the Mormon church, and the pair decided to wed after knowing each other just two weeks. 

When his friend remarks that the first time having sex is supposed to be 'a huge buzzkill', George responds that: 'I heard sometimes they cry.'

He adds: 'Cause a lot of times it's not what they're expecting.' 

But according to his younger bride in the first episode, marriage is simply 'the right thing' for the pair of them.

Talking about how they met in the first episode, The Weddings, Halie said she first met George when he was working as a missionary at her church. 

Many questions: George confesses that the only 'real sex talks' he has had have been with a friend 'who's also getting married who's never had sex'

Reality stars: The Mormon couple are one of three on the new FYI television show Teenage Newlyweds, which premieres tonight

Smitten: Halie, pictured, said she first met George when he was working as a missionary at her church

When Halie was in Utah at Christmas, she invited George to dinner with her and her family when she said they 'just kind of clicked'.

She added: 'We spent around two weeks together, I just kind of looked at him one day and I looked at him one day and I said "I kind of want to marry you...

'A big reason we didn't wait to get married, we both wanted it, why would we wait?'

She added: 'There are people who say I'm too young or he's too young. OK, well that's your opinion but we know for us it's the right thing for us.'

However, George admitted that sex was a factor: 'A big part of our religion is that we don't have any sexual relationships outside of  marriage...We're young people who like each other a little bit and so things happen...

'People try to put everybody into one category and they try to say there's this age where you're ready to get married, you can't say that. I might not even be ready to be married but you just go for it.' 

Since their marriage, which actually occurred in September, Halie and George said they have 'learned a lot'. 

'I guess Halie and I dated completely long distance. It was four months of just visiting each other and then we got engaged so we had a lot of getting to know each other to do,' George told Fox411.

Husband and wife: University of California students Brenda, 19, and Travis, 20, pictured on their wedding day, show early signs of friction

Contrasting: The couple, pictured, have differing views on gay marriage and abortion

'We talked a lot but hadn't spent a substantial amount of time together so I've learned a lot about Halie since we get married, about how she handles problems and stress. It's not bad, it's great.'

Halie said married life has been a steep learning curve but that George is 'a lot cleaner' than she had thought he would be. 

She said: 'When we were dating, it was kind of just like being on vacation together. But now that we're together all the time, we're working, we have school, and we still have fun together, but we're learning how to handle all these different things going on in our lives.' 

One couple featured on the show, University of California students Brenda, 19, and Travis, 20, show early signs of friction over differing views on God, gay marriage and abortion and even go to a marriage counselor. 

Meanwhile, Emma and Joey, 19 and 21, from Dallas, Oregon, experience dramas on their wedding day after forgetting their marriage licence and are followed as they look to buy their first home.

In the first episode, Brenda and Travis, who study in Irvine, California, admitted they knew early in their relationship that they had big ideological differences but after one year of dating still decided to get engaged.

He said: 'For them [his parents] the biggest deal was "does she love God?" and that was my biggest deal too.' 

Sweethearts: Emma and Joey, 19 and 21, pictured, from Dallas, Oregon, met at high school

Surprise: Joey proposed to Emma, pictured, on her 18th birthday

Committed: Emma, pictured, said she wants to marry him because 'he always makes me laugh' and she has 'always wanted to have a husband'

Travis, who does not believe in sex before marriage, said: 'She's more liberal and I'm more on the conservative side...

'I never thought I'd get married in the middle of college but then if you don't want to have sex until you're married you want to get married.' 

In the show they are seen having heated debates about gay marriage and abortion after rape and when they go to counselling after their marriage Travis admits that he threatened to leave Brenda.

Joey proposed to Emma on her 18th birthday after they met at high school.

Emma said she wants to marry him because 'he always makes me laugh' and she has 'always wanted to have a husband'. She added: 'I'm an only child and not a person that likes to be alone.' 

Joey, who said they were both virgins when they met, said: 'I want to marry Emma because I don't really like anybody else.'

In the first episode, they come close to not being able to get legally married after they forgot their marriage license, but the drama is resolved when it is finally found in Joey's car just before the ceremony is due to take place.