Fighting is bound to arise when one group claims they are better than another by doing X. Even from something as silly as Star Wars vs Star Trek (but don't tell them that).
The way I see it, humans are diverse and varried enough that there is no one true way. Each is different, and has different needs. That's what makes the world great.
I don't have a problem with a girl who wants to have sex, but she has to be aware of the risks and be safe.