Great link to info on how anal sphincters work

Scientific explanation in thorough detail about how the sphincters work including the mystical "2nd" one. Well written and easily understood. Found while I was researching deep penetration. Thought some of you might enjoy:

https://www.sciencedirect.com/topics/medicine-and-dentistry/internal-anal-sphincter

Thanks for posting, Chef.

Very interesting and informative. Thanks for posting

Thanks for the education. Without touching on anal sex, the article seems to imply that the key to enjoying it is causing the inner sphincter to relax. Thinking about the two small pre-sex enemas I give Carla every Sunday, first water and then liquid lube, I realize her expelling them a few minutes apart obviously opens her sphincter and facilitates penetration.

Now, I wonder whether 37 years of anal sex have somehow conditioned the sphincter also to open reflexively in response to inward pressure. She's still a little tight when I position the well-lubricated bulbous head of the very large nozzle against her anus. That's her cue to push her hips backward. In less than a minute, she opens up and all five and a half inches slide into her rectum, as she sighs with pleasure. Maybe I would penetrate her ass just as easily without the enemas, but they are highly erotic foreplay. We both look forward to them all week long.

And whatever the reason, her bottom feels loose, receptive and thoroughly satisfying to both of us.

Texas Jack