to NominalShower70 :They'd be hard in a perfect hookup, but given the anon nature and the fact the tops probably are either married or with a partner, they're nervous. Nervousness=lack of erection. Guarantee you once their penis presses against the warm, soft skin of the bottom's anus, the tight feeling of the sphincter as their head slips in, the smell of the anus (always gets me super-hard) and they become erect and can penetrate successfully. Those same sensations also cause the top to ejaculate quickly, too.