there are all kinds of things that raise testosterone.
the obvious ones are easy to research, so i'll give some stupid ones that no one would try. one of this things will lower test, it's a game

nebivolol, a beta blocker.
Inversion
abstinence, already mentioned i think.
formestane, great drug
aids
jelqing
curcumin
licorice root, non-de-glychrrinated.