Yeah, it's uncontrollable really. It's your buddy's natural reaction when being touched.

I once had a good looking female doctor examine my testicles, and got a little "excited" when she did it...

Hey if they didn't want it spitting at them, they shouldn't have fondled it.

Oh yea. My doc is a very nice lady though, she ignores it and so do I.

YeahhhhhHH!!!! I was standing in a MEPS station nekked in line, awating various stages of mass bodily inspection. The nurse dropped her pen on the floor, and bent down to grab it (with a skirt on)... Now... I realize that it was a modest skirt, and she bent down in a modest, professional fashion so that nobody saw anything they shouldn't have been seeing -but my sidewinder missile has radar, and my imagination was pretty vivid... Needless to say, the little one eyed wonder missile stood straight up into the "prepare for launch" position. The nurse turned around and started down the line doing hernia checks. When she got to my little soldier, dutifully standing at attention, she snapped it really hard on it's... it's ... Helmet. And it hurt. The little soldier dropped instantly, and the nurse never even looked up at me. She told me to turn my head and cough, and then continued on down the line like she never saw anything interesting. I don't know if I was more embarrassed by the fact that I sprouted a miniature tree in public, or that I was more embarrassed by her reaction to it. I only know I was embarrassed for either reason.

i was getting a pap smear once... and i started my period the minute my gyno started poking around down there. ouch.