Pufer, on Aug 6 2008, 02:58 AM, said:
Sure, but then it sucks as a metaphor. Mules have plenty of sex, they're just generally sterile.
Oh, they do? I just assumed they were impotent too for some reason. I'm not really well-versed in the sex lives of Equidae.
Of course, considering that the only place this expression seems to appear is in a Man Man song it's quite possible that it's entirely nonsensical.