Me and my boyfriend have sex quite frequently but there's one issue that is starting to effect are sex life. Once he gets hard as soon as we are about to have sex he'll lose his erection. We've spoken about it and he says that he starts to worry about if he won't last long or if he'll disappoint me or just losing his erection in general and that's why it happens. Does this happen to anyone else's SO and are there any tips to reassure him or try and make sure it doesn't happen as often?