How you increase your penis width?

I've heard that hanging a wash rag over it (if length allows) you can use your muscles (as if holding in urine) to lift the rag. Once you can very easily do this you can wet the rag or move up to a towel (again if length permits). This should make your erection more rigid and make it take longer for you to reach ejaculation, which can be good if you are trying to please your woman.