I at times have poor erection and pre-ejaculation. I am 30 years old unmarried, never had sex. My penis is 15 cms or more than 5.5 inches long when erect and circumference is 4 inches, I measured it. My question is whether my organ size is ok to have sex with woman. I have been doing masturbation from 16 years old even four times a day. I used to get hard rock erection every now and then, but now that is not the case. I consulted the Himalaya Doctor, he prescribed medicines in ayurveda by name 'Tentex forte'. Shall I have ayurveda medicine. please help.