I have a pretty sound hypothesis on the whole controlled-sexuality thing.  

I think it's twofold - first of all, Christianity teaches one that you must transcend the earth to get to the God-Out-There.  So, if you're feeling good in your body, you probably won't want to go for things like chastity and fasting and all that other stuff meant to get you out of your body.

More importantly, and what we see more in this day and age, it is a matter of controlling people.  Every biological entity's primary goal is to pass those genes along.  Hit it!  Screw!  Fuck like mad!  Breed!  PASS THOSE GENES!  It's how life has perpetuated itself and grown to this amazing level of diversity on the planet.  It's the most fundamental underlying urge in every living being.

And that deep and powerful urge is a deep and powerful weapon when turned against the self.  To take that deep and powerful urge and put it in an iron fist - to say, "if you do it, you will suffer in the flames of hell forever," is certainly enough to drive one to a state of helplessness.  That powerful urge has been put in a Pandora's box that you had better dare never open.  

With that level of weakening of the human spirit, cutting out one of the most fundamental drives, it leaves the human feeling strange and empty, ready to be filled with whatever bullshit those who fed you that line desire.  It certainly can account for men strapping bombs to their chests, and other such heinous behaviors.

I feel that with Paganism, part of the de-programming from Christianity is reclaiming that sacred passion of sexuality, and revelling in it deeply.  "All acts of love and pleasure are My acts."  (From the Charge of the Goddess, by Doreen Valiente.)  We embrace the life force, and are whole within ourselves as humans.