kerner says he hasnt heard of a rectum (the last part of your large intestine before your anus) getting permanently stretched out from anal sex, but he says it could happen to the anal. most people cant do the splits without a lot of stretching and training first turns out its the same for stretching your anus. Granted, the vagina does create its own lubrication usually (depending on hormones, etc.). I have chronic rectal pain in the anal sphincter, it is generally tightness sensation. Stretch my buttocks, or move front and back when i am in a sitting position. And, despite urban myths and one somewhat-flawed study that suggests otherwise, anal sex wont stretch out your anus and prevent you from holding in bowel movements. they postulate that anal sex may simply dilate and stretch the anal sphincter muscle and eventually cause damage to the muscles themselves, andor cause sensory nerve damage leading to loss of sphincter sensation and control. Given the mechanism cited above, this study has several important weaknesses. My worry is that my anus will permanently stretch out, and never return to its previous tightness this is a great concern for me because, as a virgin, id like to be tight for the first time i receive anal from a real guy, and not all loose. Id heard there were excercises to help keep the anal muscles tight, but im worried those might not work. Oral contact with the anus can put both partners at risk for hepatitis, herpes, hpv, and other infections. These are designed to be inserted into your rectum and left in place.