Well, it makes as much sense as nineteenth century bump-reading on skulls, and numerological mysticism, and sending prayers into prisms so they reach further, or asking God under your breath to change the contents of a letter you are about to open (oh, God, don't let it be an audit notification!)...
If "gayness" (gawd wotta term) is gene-driven as some people prefer to believe, maybe there is a buttock signature for it? I wouldn't know what it is, myself, of course. Haven't studied the material.
But seriously, Kat, I'm jes' funnin' yeah. I think the Butt Theory is Ass-inoid, to be sure. :>)