I think I might be a perpetrator of the "instant recovery". Which I made sure to correct because it is plain lazy. However, there was a RL life guy I know who could every now and then come once and stay hard for round two immediately. I thought I were in a fic when it first happened.

I first heard about that "coming untouched" thing from gay_sex_tips some guys there seemed to like causing it as tops but bottoms were divided, some liked it, some really didn't, I remember one guy said it felt like aliens taking over his body.

And go you for going through that list and posting your findings!