Hi, well recently I have been having sex, it has been great, but I have a couple issues. I can have an erection to have sex, but this erection only occurs with oral stimulation not with things like just touching my girl, but well I could have an erection and I am also able to put a condom on, so I start to have sex with my girl but I lose my erection when I try sex positions like doggy style, when I try missionary I can mantain it or when she rides me I can mantain it too, have any of you experienced this situation? Is frustating because I love doggy and it feels great but I start losing my erection like after 5 minutes (I don´t lose it fully but I go from a 85% erected penis to a 40% erected penis)