It is absolutely possible. I know because I've seen it happen with my wife. She says it's easy when she's turned on enough, to just squeeze her thighs together or even just do a few keigels to touch off an orgasm, but she also insists that sometimes she doesn't need to do that. Sometimes, just the sight of me cumming is enough to touch her off too.
But then, I've also made her orgasm by just sucking on or playing with her nipples.
