While doing sex, why does the pennis go down when it's inside the virgina? He is quite passive and gets a bit horny then apparently the pennis goes inside yet down while activity is in motion.

You . You could either have ed (erectile dysfunction) if your erection goes away prematurely without reaching orgasm or you could have premature ejaculation if you ejaculated too fast. The treatments are obviously different. For ed, treatments include medication such as viagra, Cialis or levitra, (vardenafil) vaccum erection device (ones sold through medical supply shop), injection therapy (boston clinic or most of urologist can order the trimix from vegas for a fraction of what boston clinic charges) and penile implant. For premature ejaculation there is no standard therapy on the market, ask your dr. For zoloft, it usually works. Franklin chu md facs.