According to the Saudi kids I used to hang out with occasionally in college, the poophole is indeed a loophole.
They say that since (vaginal) sex is prohibited until marriage in Saudi Arabia, they use the girl's ass as an alternative until they're able to get married, and it's all good with Allah.
Also I've met dumb girls in high school who claimed that they were "still virgins" because they'd only had anal sex, that one made me laugh every time.