Short of cosmetic, reconstructive surgery, there's not really much you can do. There are no magic pills – drugs or herbal – that are going to do it for you. Any of these that have any actual safe effects just promote effective blood flow within the penis, which is what's responsible for causing an erection. Increasing the bloodflow safely in the penis will allow the fullest erection you can physically have, or might prolong erection. But you can't get a bigger penis in this way safely.
The flip size is I have been with women with incredable vagina's that grip evry inch of my cock and makes it almost impossible not to come without pausing. I have also been with women with large vagina's that don't even come close to feeling as good. My thinking is the reatshionship between the cock and vagina is key and you just have to find the correct fit.
In 10 years as a sex therapist and 20 years as a marital therapist, I've had gobs of complaints from women whose partners were too big for comfortable sex. I've only had 2 in 20 years about her partner being too small. The first woman had a vaginal laxity after childbirth (previously, he had been "just right" and the second woman had marvelous orgasms with the small man but had a mental block.
Even though the male reproductive system consists of numerous organs, the penis plays an important role. Therefore, many men wish to increase the size of their genitals for enhanced sexual experience. Various exercises can help in increasing the size of the penis and it is believed that one can see a considerable improvement in the size of the penis by consistently practising these exercises for over a period. In 6 months’ time, a significant change could be observed.