I don't want to derail the derailing, but I feel I should say one more thing: if you go around judging people, fictional or otherwise, for their personal sexual choices, some people are going to judge your judging. You're entitled to your opinions, but so is everyone else on the forums. That's just how it works.
Yeah, if you're gonna open with casual sex being wrong, and you're not prepared to have your opinion judged, don't bother posting it. Few people were being disrespectful, most were just making jokes.