
With contributions by cumhardy. - Thanks!
Masturbation whilst wearing a condom. It creates a completely different sensation to normal masturbation. It can also help to delay orgasm or to intensify pleasure. Different types of condom can give different results.
I don't really know if and different brands are better than others, I havent tried them all ;)
The condoms that contain the desensitizing lube are usually called something like 'Performance' or 'Extended Pleasure' (i.e. Durex Performax)