Dirty (plot) hole
Not to be nasty, but when a penis goes into an anus it gets dirty no matter what.
So the “dicks” are shitty most of the time, more so than the “pussies” and “assholes”.
The assholes doesn’t have to defecate to putrefy the dicks, because the dicks are fixing it themselves.
And no, condoms are for “pussies”.