I'd like to thank Gavin, my F/friend and reader, for sharing the following fucking great idea.
"You say "nobody's partner has, um, felt it up in there" - by which I assume you mean that no man has reported to you, directly or via his partner (or, I suppose, via the grapevine), having felt the NuvaRing inside his partner during intercourse. I have.
It's not unpleasant, and can even be a little stimulating. This is, of course, easily avoided, in a playful move that turns NuvaRing into c**kring. Either partner can easily (and gently, guys!) reach "up in there", catch the ring with a finger, and (assuming the man in question is not monstrously huge - it's a slightly stretchy ring, and several inches in diameter) drop it over the top of a nearby penis. That can be as stimulating as you want it to be, or not. The guy is not likely to forget to return the ring, which is designed to be left out for some small number of hours per day. Hours. If you're sleeping with a man who might just leave without returning the ring, you need to a) go back to condoms, b) ditch the loser, and c) get tested for STDs and pregnancy."
Way to go, Gavin.