Sex is to connect ur slef with some one u love in a higher and deeper level. U cant just stay friends after having sex. Not to mention it is biblically forbiden. Every time u have sex they leave, u lose a little bit of ur self. And ur marriage will not be as satisfying. Plus even in the movie u see how hard it was for them to ditach. Keep in my mind that was the fantasized and unrealistic verse, real life sucks by like 45% so u get hurt more. The point is don't do it. Control urself(read Galatian 5)