What is sexual stimuli?

Question

what does it mean exactly, to do what.. im a guy.

i want to make sure what i think it means is right.

i was reading this article

http://www.bodybuilding.com/fun/south99.htm

its under Putting It All Together: A Hormone Protocol

Answer 1

A sexual stimulus is something that makes you horny.  (Stimuli is plural for stimulus.)

A s**y girl on TV or a girly magazine.  Or, of course, a girlfriend caressing you, that sort of thing.  Those would be sexual stimuli.