I'm pretty certain that this movie was released within the last five years and it was potentially foreign based on how open the film was about teenage sexuality with young actors. The movie isn't focused on sex but more about a boy's first love that eventually leads to his first time with a more experienced girl. It's a drama but I think there are some brief mildly comedic factors.
For the things I remember, it's about a timid young teenage boy (alter boy as a side plot) who has never fallen for a girl before. When a new 'very attractive' girl, who is raised in a non-religious family, moves in, he offers to 'help her' in some way (maybe for the church). However, he does this for the wrong reasons, mainly to hang around their house and look at her. I believe the girl even smokes and at one point the boy was willing to go out to buy her smokes, and gets in trouble from his family.
The girl knows the boy is a virgin and that she is way out of his league but she plays along with the boy's 'cute' obsession with her. The movie plays through his first kiss and eventually the night where he loses his virginity.
I think I even remember that the timid boy works on getting out of his shell after befriending a crude boy, where they at one point steal a neighbor's car. But I may be mixing up foreign movies.
Unlike most movies, I enjoyed the movie's blunt honesty about teenage appeal and even sex, especially with their choice to involve young actors.