Scrumpyjack, if gay men have chosen to be attracted to men, then straight men must have chosen to be attracted to women. So you aren't biologically attracted to women, you chose to be so? You have got it the wrong way round. Some men are attracted to men and so they are gay. Some men are attracted to women and so they are straight. You can choose with whom you have sex, but not to whom you are attracted. Many gay men spend their early years having sex with women, in order to conform with society or religious restrictions.
All human beings are covered in body hair all over, however, women's body hair tends to be lighter in colour, shorter and more downy, so seems less "hairy". Actually many gay men do not like body hair, both on themselves and others and go for the waxed look. There are plenty of other men, usually called "bears", who really like lots of body hair, and some even specifically like a really hairy arse.
Very few men, gay or straight, want to get shit on their cock. Would you get a bell-end full of shit if you stuck your cock up a woman's arse? Is a man's arse full of shit but a woman's arse is not? Generally, no one wants to have sex (anal or otherwise) when they have an arse full of shit, so they make sure they take a dump beforehand.