I'm pretty sure it's the bottoms reaction that let's them know. Because usually it's like the bottom has some weird reaction the the top does the whole "heh... I've found it 1 reply
I mean, when men go get their prostate checked, the doctor gets in there and feels around for it to see if all is good. So I guess the answer to your question is "yes". Google also seems to agree. 1 reply
Pretty easy to find, if you ever need or want to. Advice from someone who has done a few prostate exams, just insert your finger and press towards the person’s belly button. You should feel a little rubbery bump. People will also kinda let yk you’ve found it either verbally or through their facial expressions. 3 reply