<s>[INST] hello,sir i am doing masturbation from last 6 years.now i am 20.my penis length is 4 when it fully erect.now i can masturbate hardly twice a week because my semen volume is less that is just in drops that is also just after touching the penis.my penis is also curved.can i increase my penis size.can again make sex.please helpme.guide me. [/INST] Hello, Normally a penis is curved a little on sideways and the average size of the penis is around 5 inches. Masturbation does not cause any sort of impotence and issues with erection or semen quality.  If you are still worried then I suggest you to visit your doctor to be tested for semen analysis and other supportive tests. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.  </s>