I'm not a homophobe in the least
hell I enjoy going to gay clubs occassionally
but it is much more difficult to "learn" to take a cock up the ass than it is for a women to take a cock in her pussy
and I know from speaking to women about butt love
and I honestly can't see any difference from an anatomatical angle in the male and female anus
this is not to say that it can't be enjoyable
but anal sex is "learned",plain and simple
even oral sex is learned
straight vaginal male-female sex is almost born known