When I'm having sex with the g/f, I keep hitting her bladder which causes her discomfort. It's not so much that I'm THAT big, but it's more like she's very skinny so all her internal organs are squished pretty close together I would assume. I was thinking of using a cock ring to reduce how far I can go in, but sometimes 2/3-3/4 of the way in is too much. As much as I try not to go all the way in, it's hard to be perfect all the time. Any suggestions?