Your anal sphincter, the muscular ring at the base of your colon, feels very tight when you first start to play in it.
There is a third pleasure spot: Your hole. It’s roughly the size of a walnut, and it feels really good when pressed or rubbed (by prostate toys, fingers, etc.). The prostate is a g-spot, and it’s located about two inches (depending on your age and your anatomy) inside your ass. Most guys know the underside of the penis feels good when stimulated.