I seem to have always had this problem ever since puberty, which makes for no fun when trying have penetrative intercourse with a partner. The problem is that my penis is too heavy when I have an erection so it bends right at the base of the shaft and this is sometimes painful and pinching. My boyfriend's penis is nearly as long and significantly thicker, but his sticks straight out as if he has it braced with a rod while my penis is struggling under its own weight. Is there some sort of exercise I can do to increase the hardness of my penis, specifically the corpus cavernosum? I don't know what to do and I'm tired of not being able to enjoy penetrative sex.