I've seen a flick where a bloke actually shot his load in one of those things. The model in question had a vibrating egg at the top that stimulated the head (and I guess that the guy had already stimulated himself to the point where he would cum on cue ... )
Balas
SirCumLicker
Now that's what i call some serious pumping action ^_^ don't bruise that sweet cock of yours ~_^
just sayinnnnnnn LOL