Stubble looks great but is oh so itchy and gives you terrible beard rash post-snoggery!
Beards are better snog-wise
And as for homosexual proportionality, I'm sure TC's right - it'll be the same among folk who bike as folk who don't. (I think it was TC said it anyway.)
Plenty of gay bikers... quite a few on here... rather fanciable too, some of them, then you notice the "seeking: male" bit and think d'oh! Typical!