morning wood—stays erect till I finally get my sleepy ass out of bed and go urinate.
I can maintain an erection while “making out” (kissing, fondling her breasts, etc).
No stimulation whatsoever? about 1 minute.
Oddly enough, it stays erect for a few minutes after a climax.
special circumstances will bring about and sustain an erection for me. Wearing certain pants, a hot stuffy room, a full bladder/colon, leaning against the washer/dryer while it’s running, hanging upside down (from monkeybars, etc). I once owned this ‘88 toyota corolla that had an unusual bulge in the middle of the driver’s seat. It would massage/rub/push against the area between my anus and balls. I would get an erection every time I drove it somewhere. I miss that car!