Just say "NO" to coffee.
I call it "The Devil's Bean". Not only does it taste like shit, but it will melt the innards of your mouth with its scalding hot temperature; giving you 3rd degree burns (as evidenced by that old lawsuit with that old lady who bought coffee at the drive thru of McDonald's and spilled it on her).
And if that's not enough evidence...
Fact: Coffee causes shrinkage ("Kilgore Trout" says so right here):
Answer (1 of 2): It can, yes. As a stimulant, it causes peripheral vasoconstriction. An erection is dependent on vasodilation, the opposite. When blood vessels constrict, blood flow is reduced to these areas and to be blunt about it, stimulants will make your junk shrink— methamphetamine users ha...
www.quora.com
So simply just don't do it. The end result is only excruciating pain, melted & shrunken privates and sometimes even a hot, fiery liquid death.