Ok, so, my girlfriend and I have been having oral sex quite frequently for sometime and everything has been going fine. Here recently we have started having vaginal and anal sex. It works but only when I rush to put the condom on and everything goes in quickly. If it doesn't happen exactly that way then I will begin going limp and it is not recoverable. Vaginal sex isn't really the problem, but anal sex, with the time it takes to get it in, it goes limp. This really deadens our sex life and I was wondering if anyone had tips to make my erection "stronger", I guess you would say. It also seems that I keep my erection much more easily laying down than standing up, or any other position then laying down.