This may sound very odd but it's my preference

The joy of knowing that no man has screwed that hole before me is enough for me

Sex ties a woman to her ex forever, whenever she sees any of her ex sex mate, a flame sparks, it takes a lot of restraint for her not to desire that ex again.

If she enjoys sex with her exes than her husband! She will forever despise her husband.

Besides majority of Virgins have good character, that's why they're able to maintain their chastity in the first place