I've thought about this at length, and the conclusion I came to is that violence about self-sufficiency, while sex is about cooperation. With violence, you take matters into your own hands and you're in control regardless of what others feel. With sex, it's the exact opposite. You're at their mercy and they have power over you.

It makes sense in our hostile culture to teach kids about self-sufficiency and taking power for themselves. If they give that power up to others, then it opens them up to manipulation and exploitation.

I'm not making a judgement call on what's right or wrong, only what is.