Penis Dancing

I got the same experience. My dick bounces a lot, and that bouncing makes it swell a lot. i think it's a consequence of the involountary kegels i have when im riding

For me, that dance only adds to the pleasure. It's all part of the experience.

It's distracting for me as well. When I get really hard it makes me involuntary clench and kills my momentum just like you said. It focuses my attention on my penis rather than my prostate. I am trying to relax more when I get hard, but sometimes it's difficult to do so. For me, being semi-hard is best.

I think we need a video of this to better understand what’s happening here

I have the same contractions as well (i really like 'm :)). @UKguy : It looks something like this.

https://it.pornhub.com/view_video.php?viewkey=ph57ce6b2de47ef

When younger and I could get an erection at the drop of a hat, I had this too. Now that I'm in my 50s erections require a lot more and I no longer have this.

Haven't experienced penis dancing but have experienced the base in the perenium dancing along with the head of the Aneros as it touches the
prostate! Feels like the base of the cock is masturbating almost to
the point of ejaculating! The head of the Aneros strokes the prostate back and forth! What an awesome feeling!