To keep the foot-fetishists away.
Same here! Granted I don't like socks or shoes, period, so socks are the *first* thing I'll take off let alone leave them on for sex. Not that the guy's feet are of any particular importance, but leaving them on is like the gay equivalent of a woman in hose and heels, just a weird look almost always.I HATE that. I don't know exactly why, but I absolutely hate it when people take all their clothes off except their socks.