We've (21F, 25M) been officially together for about 2 months. He has a very high sex drive, as well as I do, but sometimes he takes so long to cum it starts to hurt me. Other times, either of us gets tired and we stop because it's been too long, more than one hour. Mostly our sex involves PIV and oral. I guess we are both kinky but not experimenting a lot with it yet, guess we're still finding out what the other person likes. We haven't discussed yet about it. He asked me if I thought it was annoying one day - and honestly I didn't, but as it gets more frequent, I really worry he has some masturbation issues that are interfering with the situation. Also, I worry about it being related to how he sees me. He is a very shy and anxious person, and he told me he still gets nervous around me in other situations, but during sex I have never noticed it. Any advice would be helpful.