it took some work to show my girlfriend but heres one of mine...
right below the head of the penis, around the brim more twords the back of the actual stem there is a small bump, now i've read about this so its pretty much there with any man, you just have to find it... when you touch this and LIGHTLY massage it, oh my god it feels amazing.. please for the sake of god though DO NOT GO TO HARD OR FAST!
also if you kiss a guys ear, and play with the lobe with your tounge and you make light moaning noises and breathe into their ear -- it feels great and it really gets me going.
my input...