I used to find it painful getting the Progasm home.
Then I found a website describing the sphincter - how it is actually two u-shaped muscles that are stacked, one above the other. It's much easier gliding past these if you tip the handle towards your back, aiming the tip towards your stomach, rather than trying to go straight in.
I'm enjoying the benefits of entry, at this very minute.
Where will the big guy wander next?
Let's find out!
Cheers