This isn't a religious "holierthanthou" rant thread but one that should make people think.
It's a fact that more anal sex occurs in heterosexual relationships than homosexual ones. But what most people don't think about is where the initial idea comes from "to try it". The likelihood that it was something you heard your mate mention down at the pub is slim. Exposure to fantasies such as bondage, threesome's from lesbian porn, dogging, 'rape fantasy' and all that other stuff, I think, are much more likely to come from people seeing it on the web and then wanting to replicate what they see in real life with real people, their SO or others.
Should be interesting to see how many people let other people [read as 'the internet'] define their sex lives. Define who/what we find sexually attractive.
As Luther says to Ripley:
DCI Luther: Do you have any sexual fantasies?
DS Ripley: What? Yeah, not that I'm gonna tell you about.
DCI Luther: Does the reality ever live up to the fantasy?
DS Ripley: Well, I, um— well, no, no, not really.
DCI Luther: Yeah, it can't, can it?