Celibacy is unnatural though, but so is Christianity.

The celibacy is analogous to the focus on spirit, light and heaven in Christianity. The dark, earthy stuff is not dealt with. It's called the Devil. In this sense Christianity is very spiritual.

So the celibacy makes sense. You move as far away from the devil and anything "pagan". Problem is that the Devil might take revenge.

The outbreak of perverted sexuality is also analogous to the outbreak of certain regressive "pagan" things in our culture.

I think that if you don't have any normal romantic interaction with the opposite sex, and if this goes on for a long time, then your sexuality might stay in an undifferentiated state or become perverted. It shouldn't come as a surprise.