Yeah, but there's a difference between understanding those issues and their dangers, and then disapproving of them. If you're claiming casual sex is wrong on the basis that one may contract something- then surely a liberal environment where people can be educated about the dangers is more beneficial than one where people embarrassed because they think they will be made to feel like they have done wrong. What's the point of 'disapproving' just because there's a risk attached, it's not like you're
in danger of catching something from their activity.
I don't 'disapprove', as such, (in fact I hardly 'judge' anything, we are what we are and I just observe it) but I understand the issues and understand that even certain issues, like excessive drinking, may be the result of inner turmoil, although I would argue that mostly they are not, particularly here in the UK where it's taken as the norm.
With regards to gay sex, what is the relevance of that and why does it matter? Are you suggesting that physically 'dirty' translates to morally 'dirty'? I understand where that opinion comes from but it isn't actually true, my best friend is gay and I know that (sorry there's no gentle way of putting this) basically the majority of the time the rectum is clean, and they would not engage in intercourse if it wasn't. Also, apparently, doing that act doesn't make it taste any different afterwards.
There you go, some nice myths dispelled