My girlfriend is a virgin and is kinda prude. Although we have gotten to dry humping and I have pleasured her with my hand (never to a full orgasm, she isnt ready).

It has gotten frustrating never climaxing so I found a way to get off. When we dry hump I get a good angle so my penis gets traction and the cogs start turning.

I guess I have a weird talent of being able to have an orgasm poker face, so when we dry hump I end up cumming in my pants but she never knows...

I thought it was gross and weird at first but it helps me not push her into going any further to where she doesn't want to go.