[Windflier]

Well, here’s your answer. If a man gets physically aroused by the sight of naked men, then it’s a pretty good bet he’s a poofter.

I think that qualifies as proof.

[DBrow]

http://www.forensic-evidence.com/site/Behv_Evid/BeE00005_2.html

Here is an “objective” court approved method for finding out what turns you on. There are lots of problems with it but it has been used to prove “gayness” or at least a physiological response to “gay” stimuli.