<s>[INST] I had sex with my girl friend long time ago . I was down she was up and she make it the penis to much down with her ass and i feeld a bit pain . since that time my penis is not strong enough .! But also i masturabte every day im 29 yer old pleas what should i DO . [/INST] DearWe understand your concernsI went through your details. I don't think you have any erection problems like erectile dysfunction. You may be just having pain at the head of the penis due to the anal sex and therefore, the erection may not be proper. Apprehension about the sexual intercourse with your girl friend can be one reason for your erectile problem. Apprehension is always obsessive. I suggest you to consult a psychologist for a detailed counseling session. You must understand the erection process and mental state. Secondly, for safety, you may consult an urologist for investigation.If you require more of my help in this aspect, please use this URL.  Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications.Good luck. Take care. </s>