Porn is absurd in general, I don't think it's limited to gay porn. Most of it is just silly - I roll my eyes too much to watch it very often.
Feet? I'm not disgusted by them but they don't turn me on either. I have a friend (straight woman) who wears a size 9 shoe (HUGE for a woman who is only 5'4") and has really long toes - like, an long as my thumb. Now THAT grosses me out.