People that use androgel report gains on there penis size
Try Googling ‘androgel penis’. There are also plenty of threads on here about androgel and similar gels etc.
If they worked for increasing penis size, don’t you think every man in the developed world would be using up the worlds supplies? Look what happened with Viagra. The same 10x over would happen with a ‘rub it on’ product that genuinely did increase size, and it would be incredibly expensive!
Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. And the ideal penis size is 7.6" BPEL x 5.6" Mid Girth.