We're all animals, that we all respond to the same stimuli. If you want to motivate somebody not to have premarital sex, or motivate black bears not to go diving into dumpsters, first you have to think about why they do it. Telling them to stop isn't going to help. There has to be some incentive for them to alter their behavior.
I've said it a million times: Romance languages lead to premarital sex.
Christy: "My grandma made this. I've had it since elementary school. " Todd: "I never knew that. " Christy: "I never knew you left your towel on the floor. " Todd: "Uh-oh. Is this one of those issues they talked about in our premarital counseling? Should I hang up towels so you feel more loved?
If premarital sex is a sin, who is the victim?
I have certain moral parameters that I do not cross in writing; I don't write about adultery or kids having premarital sex.