Good Morning , my name is Henry, i am a 23 yrs old man.. i have a problem with my penis the thing is when i'm having sex with my girlfriend after the first round of sex my penis falls i will have to wait for 25mins for it to erect again, once it comes erect i feel this pain in my penis, then i will just have to endure the pain through out the 2nd round once i *** i tell her i'm tired cause of the pain... And it happnes everytime im going for a second round.. Pls help me what is my problem