Based on what he's offered here he seems to have a heavily tactile/labial erogenous influence to his attraction to sexual contact in general. The fact that he didn't mention partners (male or female) with whom he's had sexual intercourse is telling. (One would assume at 31 he's not a virgin, no?) I wouldn't be surprised if he can achieve climax without penetrative sex, and may not even desire it (similar to what they call a "side"). And that too would inform his choice of romantic partner. But as far as his romantic attraction, who's to say as he didn't really offer that much in the way of that. I presume he knows why he leans less likely to males romantically (some closely held notion of what male/male intimate relationships are vs a female/male) but chose not to offer it, as is his right to his own privacy.