Hi sobuz,
welcome to health care magic,
I can certainly understand your concern about size of the penis and erection, I can.advise you can check yourself whether you have any problem with your erection...By simple test called NPT...ie. Nocturnal penile
tumescence.....In which erections occur normally early mornings during sleep ..So if it is normal, nothing to worry much
You have mentioned that your another concern is about your size , the average size of the penis is 3- 4 inches normally, and 5 inches when erected..So nothing to worry if it is nearer to this range. If it is small, you can start some
testosterone . Please get back to me if so
You said that your penis is getting erected when you see your girlfriend, so stimulation is fine, but it has to withstand for long time, for which drugs like
sildenafil can be definitely helpful to increase the production of nitric oxide ie NO, for sustained erection.Hope this information would definitely help you
Post your further questions if any, I ll always be available to answer them
Thank you