Im usually against any form of plastic surgery, but this subject is really intriguing. is it possible to either increase the length of your penis and/or possible to increase the girth of your penis? if not, why isnt this possible?

You can likely find a urologist who will build you whatever you want, if that is your goal. The procedures have been available for years. Be sure to understand that any such procedures can have significant complications.

Lately a group of Urologist in California have started doing a procedure for what you mention. In general in the past it was tried was unsuccessful and condemned and abandoned by general Urologists

If your sexual activity is normal and no complications, than why cause a possible problem with surgery. Breasts and butt enhancements have lead to future problems, leave your manhood as is.