I know usually its the other way around for us blokes (cumming too soon), but sometimes my gf and I can have sex for like, well over an hour and I still wont cum. Which sounds great, but it kinda sucks because she loves cum and also she gets stuck in her head and im just like "idk its not you its me like i want to but nothing is coming out". Its not all the time, but sometimes. Usually on round 2 or 3 if we are just feeling really horny, which we often are. Should I be drinking more water? Taking some kind of vitamin supplements? Its weird because sometimes I can masturbate multiple times a day and its all working down below.

Any other fellas (or lady-fellas' partners) have this happen and how did you get over it? To be clear, we are both still having loads of fun, but would have more fun with more loads. Thanks! Have a nice day.