Okay, Lan. I'll spill.
One time I had a prostate exam near my 25th birthday. I figured, why the hell not, prostate cancer runs in the family and I gotta get used to em when I turn 30 so I should get one now just to make sure and be on the safe side.
Right now I want you to make a fist and stick your finger inside the hole your fist starts.
That is what a prostate exam is like, except instead of your fist, it's your asshole. I was pretty disappointed because at a young age while laying in bed one of the first things I realized was that if you rub your butt it feels good.