Or don't. It's your choise.
Besides, the only actual enlarging procedures are expensive surgeries, that have a high chance of ending up bad. Of course, have in mind that unless your penis classifies as a so-called "micro penis", any insecurity you have concerning the size is mostly unfounded, and only fueled by irrelevant male competitive attitudes, similar to how certain women push themselves for further weight losses, based on how other women percieve them, rather than men. Men want curves and forms, we all know, but we still get the blame for anorectic women. Women want a man who can care and provide, and sometimes chase unwanted people away, his penis needs to be big enough to function its purpose, and most penises are precisely this size. The only difference is men aren't even observant enough to blame either men or women for their penis-size insecurities.
One of the more frustrating arguments I've had with females, have been to argue for them to NOT loose weight, and NOT get boob enlargements, when they desired to, based on what other females would think of them.
ENLARGE UR BALLS!!!