We've been having sex 2-3 times a week for the past 2 weeks. She usually comes very easily, first from me going down on her then again from sex. She's not a virgin but said she hasn't had much experience with sex and usually gets pretty sore after spending the night. Last night we agreed that we both want this to be a relationship. After that we had sex and she came twice from PIV and we had to stop after maybe 15-20 minutes because she said she needed a break. We tried having sex again in the morning but even after going down on her, she was too tight for me to put it in. She said that last night when she went to the bathroom she was bleeding a bit. She's quite a bit smaller than me but that's never really caused an issue. Am I simply going too deep? Are there more comfortable positions we could be doing? We usually start missionary, then she rides, then doggy, then repeat. I'd say I'm well endowed but none of my previous partners or hook ups have been completely unable to keep going.