Rumor has it that four Popes have died while having sex.
Judeo-Christian Religion: Until recently, much of our world religious culture disdained sex and masturbation. It wasn’t always that way. Many ancient religions held sex in the highest regard, celebrated sex as a form of worship, and saw it as being God-like.
It turns that finding some way to make people feel guilty gives you or your organization (church) great power over them. What better way to control people, then, than to make them feel masturbation and various sexual practices are taboo?