How to improve stifness in penis? Am not sure what exactly is the problem here, but am terribly worried. Iam a 25 year old SW engg. I have a girlfriend and when we indulged in sex, my erection was not STIFF enough for intercourse.I have never had any relationship or have never indulged in sex before. But with my GF i have tried to a few times and ALL the time my erection was not STIFF enough for penetration. Even when i masturbate, i can make out that my penis is not hard enough.(am able to masturbate though) . However am sexually very active and get turned on quickly and stuff. but the only issue is with my hardness. Please suggest a remedy,through tablets coz am a little skeptical to visit any doctors as of now. Note:- I am not that built or athletic types, but am 6 foot weight around 80kg and i do smoke & drink. Any help on this would be greatly appreciated.