I wondered about that myself and mentioned it in a post a while back. People will say the anus is an erogenous zone and the prostate is the male g spot, but those guys are never hard. It doesn't make much sense at all. And I don't understand in straight porn when a man is kissing a woman, sucking her breasts, and going down on her and he is completely flaccid. What's wrong with these people? That's why I can't tolerate porn. And those fake orgasms are just awful.
That's because you equate erotic sensation and erection exclusively. Many men have learned to locate other triggers for their erotic response. This doesn't mean that their dicks are useless (at all), just that when the focus is elsewhere, the penis is no longer necessarily responding.
When the focus returns to the penis, erection returns. It's really an issue of wiring, that's all.
BINGO......I'm 100% bottom and am rarely hard when getting fucked......When I'm getting fucked it's ALL about my ass and the pleasurable sensations there, not my cock......I have what I call ASSGASMS, where waves of unbelievably pleasurable sensations spread from my ass to my body.....my ass actually twitches......HEAVEN
I've been with guys who can assgasm. It's amazing.
I myself am wired so nipple stimulation sets off shuddering, full body orgasm. These shudders and waves of intense sensation can continue indefinitely, unlike penile orgasm which essentially ends the play until I'm able to be aroused again (sometimes an hour, sometimes longer).
The combo of nipple stimulation and penile stimulation can keep me rock hard and drooling precum, especially while fucking. The ability to hold and let go (without cumming) in turn can allow me to edge almost indefinitely. But finding the added boost of sensation required for ejaculation after several hours of edging can be tricky.