Easier insertions past the sigmoid?

Hi all anal fetish friends. I recently found a tip that I want to share. A lot of posts are about how to get behind the sigmoid turn. Well someone in FetLife told me to relax some kind of muscle that controls the sigmoid spincher or so.

Sit in a squat and do like if you are going to release a poopy. It seems to open or straighten the bend a little.

I tried it and sure enough my double header dildo went in easy, like "open sesame"

Any thoughts from the more experienced players and medical pros.

I'll have to keep working on getting full insertion with my SN Model B.