Fingering the inner ring to help expulsion

I've found that inserting a finger or two and vigorously rubbing the sphincter between the colon and the rectum causes involuntary contractions and bearing down that helps me to ensure a full emptying. An additional benefit is that then sensation is very arrousing (no surprise since I like deep insertions) and I get close to orgasm from the stimulation. Maybe sometime I'll indeed cum just from that. Anyone else observe this expulsion assistance method?

Yes, it works, and is highly stimulating as well.

More effective to press gently on the tummy starting in the upper left working right and then down.

How do you get your finger that far up your rectum?

More effective to press gently on the tummy starting in the upper left working right and then down.

I definitely do massaging as well, but the internal stimulation feels very good.

How do you get your finger that far up your rectum?

I typically only do this if I'm doing an enema session lying down in the shower. I'm only pushing a finger length inside to reach the this sphincter due to the downward movement of the colon when bearing down during expulsion. It's actually very easy to reach! Again, the sensation is very pleasurable, so I say poke around and try it yourself.