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Digestive system
Sensation to enlargement, pain and touch
The rectum only senses enlargement and stretch, while the anal canal can sense temperature, touch and pain. This makes the anal canal more fun to play with than the rectum which will only notice if you stretch its walls. Above the rectum there are no receptors to sense pain or injury so penetration beyond this point is more risky.
Located to the front of the rectum (tummy side) is your prostate gland, doughnut-shaped and about the size of a chestnut. Stimulating or rubbing during sex can be a big turn-on which is why getting fucked in the right position can be so pleasurable. However, the prostate is very sensitive to pressure and harpoon guns!
Prostate problems | MEN R US
Putting things up your arse | MEN R US