Happened to me on a couple occasions mid punt , i was pretty shocked as never happened before , for me my cock was numb with very little feeling after sex for a while ,
in both occasions it actually turned out to be the type of condoms used ( they were these delay / stay harder longer type ) and a bit tight , i think the lube inside had some kind of numbing agent (to make you last longer) but for me it was to much , it was a weird sensation .