For me Cheyenne has hit it -- strap-on is very much humiliating and degrading to me, and that's the element of punishment funishment. I enjoy that aspect of it, and totally understand it as fantasy punishment, the same way forced pussy worship is not really forced (wink wink!!), etc.

I do not feel pain during strap-on -- in fact, pain is definitely something one usually shouldn't feel, I'd say. Probably not a good sign, in most cases. However, strap-on does feel extremely intense to me. I mean, really intense. That intensity translates to the same expressions you might see in a video clip -- I'm pretty sure my entire head turns red, my eyes bulge, I make silly sounds, etc. LOL ... it's intensity, not pain, but someone watching could interpret it according to however their fantasies dictate

I think video and online based descriptions make more sense when you can figure out whether the perspective is one of male fantasy perspective (in which case, strapon is punishment) vs a technical or non-prurient discussion