Guilt

JTA:

Shayndi Raice, a student at Y.U.’s Bernard Revel Graduate School of Jewish Studies and a 2004 graduate of Stern College, says the Orthodox community needs to focus more on psychological issues surrounding sex and dating.
“I think there’s definitely a lot of guilt associated with sexuality for men,” she says.
“And it affects their relationships.”

Why stop at the men? The same is true for many women, who are educated to be completely Shomer Negiah, and when they are still single in their mid 20s and later, merely touching a man, let alone sleeping with one, can cause enormous guilt and anxiety. You only have to look back at the Never Been Kissed blog to see what they're talking about. And after all that, who says the feelings are resolved with marriage?