It does seem quite silly really, but then I remember that my 'who cares what the sex is like as long as it's by mutual consent?' attitude is probably in the minority even today. And anal sex *is* a squick for some people (it used to be for me, until I got used to the idea) where mere frottage is not.

*Shrug* - I think the rest of the world has not had the exposure to slash fiction we've had, so remains a great deal more shockable.