Dave admit it, you’ve always wanted to be a porn star.
The responses here has been most enlightening. Personally, I never thought it felt like a boomerang and the best description would be …::snort:::a well steamed hot dog…no wait…bratwurst powered by the little engine that could.
If my schlong were to… er… ‘boomerang’ anything beyond a subtle curve, I’m pretty sure I’d know about it. Actually, no. Damn sure!
As for the ‘inside’ scoop on being inside, I’d use the terms ‘enveloping’,‘warm’ and ‘soft’. Put your finger in your wet mouth and concentrate on how your finger feels. Transfer that sensation to a more private and sensitive part of your body and you’ll get the idea.
One thing I hate is cervix bumping. Yee-owch.
Sometimes when I’m going in for the first time, it feels like a thousand little fingers doing a happy, wet dance. I also like it when my SO is cumming and I can feel all her muscles throbbing and convulsing in time with her throes.
Umm… errr…
Gotta go, now. Back in 15 mins 
DAVEW0071 covered a lot of the physical sensation.
There is also the emotional sensation of being accepted (accomodated? Welcomed?) Then of course, there is the awesome sensation of feeling her pulse (and I’m not talking about checking her wrist with a stopwatch, either!)
~~Baloo