heard this one in elementry and stuck with me since then
a soldier comes back from war and wants to go to a whore house so his friend takes him and all that is left is this one old 60 year old lady so the soldier doesnt care since it has been a really long time well he goes up to the room and does his thing with her and he sais its a little dry is there anything you can do to fix that. So she goes to the restroom and comes back and the soldier replies my God it feels great what did you do? The wh*re tells him she just peeled the scab and let the puss flow.
yeah kinda gross but its still a joke.