Because there is a heightened attitude in the last decade in Christian circles to venerate virginity, make it a fetish, that young women are very sensitive about it. It can become a mantra that any pleasure from sex is evil.
On the flip side, this has brought the old practice of anal sex back, not only as a method to prevent conception, but also because it isn't viewed as "sex" and preserves the woman's virginity.
Go figure.
It's quite an image to her nonChrsitian boyfriend when the Christian girl climbs onto him and takes his mighty penis into her sexy butt.
She so wants to preserve her virginity and "Christian innocence", but loses a lot of that "naivete" about the real world of dating and sex when she takes her man's hard cock deep inside her poop-hole.
It's also quite a site when the Christian girl lays-back and lets her boyfriend climb onto her and rub his cock up against her sweet innocent Christian pussy with his cock.
Engaging in this "simulated sex," where he grinds up against her but "promises" not to enter her pussy, she also loses a lot of her Christian innocence when he shoots his spermy cum all over her tummy.
It's also quite a site for her nonChristian boyfriend when she eventually sleeps with him. As she rides him and takes his penis deep inside her, he sees that cross necklace she always wears bouncing between her boobs, which he feels-up and squeezes as he drills her deep...