I push out his penis during sex

Hey everyone! I've been trying to find information on this but I have only come across women saying they experience this same thing during orgasm. When I have sex with my partner, it feels so good that my vagina pushes his penis out. I imagine I am unconsciously "bearing down" to enhance pleasure, but it's a little bit embarrassing and I feel guilty that I'm interrupting his rhythm by doing this. Sometimes I think I even pee a bit as this is happening. The sensation is so good and not what I consider a typical orgasm, although I see the electric fireworks behind my eyelids like during an orgasm, and my body contracts. It is a sensation similar to when a man does that "make you squirt" hand technique with his hands on my g-spot which feels like a manually manipulated orgasm - more like a "milking", but doesn't feel like the orgasms I am used to which I experience through oral sex, hands or masturbation.

Does anybody here experience this too? Guys, does it feel good when a woman "bears down" on your penis during sex? Is it annoying to have your penis pushed out? My partner acts totally cool about it but he might just be being nice!