Hello I have read your statement and i understand you are concerned about your penis size and premature ejaculation Your main concern seems to be premature ejaculation. Let me first go through its causes after which i will discuss its treatment and will further guide you The most common cause of premature ejaculation is stress and anxiety. Since you experience premature ejaculation when you masturbate, it is expected you will experience the same while having sexual intercourse with your partner. Premature ejaculation treatment goals are aimed at the behavioral therapy of the patient. During sexual intercourse you have to identify the points which stimulate you more and you can communicate with your partner to stop at that point and change the position etc. Woman on top position gives less excitation to male, thus prolonging time with the same erection Also, use of condom sensitize skin to lesser extend, hereby, prolonging duration All these things need your good sexual understanding with your partener Now coming to Medical therapy, take tab dapoxetine 60 mg 30 mins before sexual intercourse. It is an SSRI drug, which is basically an antidepressant whose side effect is, actually, delayed ejaculation, and thus it was approved by FDA few years back for treatment of premature ejaculation There is no FDA approved drug that could increase penis size, However there are surgeries that can do so. But i recommend not to go for any of those as 4 inch with good erection and increased ejaculation time will satisfy your partener I hope this will solve your issue Let me know if any Query Thanks Dr Nasir Ali