Dear service user, Thanks for writing to HCM. I understand your concern. Penis size has no effect on sexual satisfaction of the either partner. ‘’Bigger is better’’ is very rampant myth shown in pornography. Don t let myth ruin your sex life. Only lower vagina (outer one and half inch) lips and clitoris is sensitive, deeper part is largely insensitive. You remember that what important is strength and not the length! Size of erect penis anything more than 2 inch (Yours erect penis is 12 cm) is sufficient for satisfaction of either partner. No medicine needed to grow penis. Erectile dysfunction in your case is surely curable. The anxiety about erection quality and unrealistic beliefs of perceived harmful effects of masturbation leads to loosening of erection. This is purely psychological issue. Hand practice (masturbation for sexual pleasure) is a normal and healthy part of sexual satisfaction. It does not have any adverse health effects. Masturbation does not reduce penis size. Masturbation does not cause fragile bones, dark circles, poor memory or harmful effect on personality and one s appearance. I suggest psychological counseling with sex therapist or psychiatrist. No medicine needed. Wish you good health.