According to Dave Grossman (author of On Combat and On Killing), there is a corellation between sex and violence (killing, watching others being killed, thinking of killing, thinking of being killed, etc.).

Not a shrink, and not trying to be; so, I dunno if sex is a cause or an effect. I suppose the two things could be interactive.

If you think about it, the whole thing might be an ancient, hard-wired species survival mechanism: take a life, create a life.

Regards

Mike