I have had #3 done to me and it is am incredible feeling some where between being very uncomfortable and pleasure. A penis head is loaded with nerve endings that do not like to be rubbed. It can also be done by just using the thumb.
Head rubbing is a part of bdsm and there are numerous vids on the net that show a man bound and the woman giving his head a good rubbing, then making him cum, and continuing the rubbing. After cum rubbing is worse because the head becomes even more sensitive.
