Not at all grossed-out. Once, when I was very young, it was ever so slightly shocking, if only because it was rare and unexpected. But I think I got over that by some time in high school. Two guys kissing wasn’t at all shocking when I first went to college (one of the gayest ever, according to Out Magazine).
Yes, but we don’t all use them to prop up one end of a couch.
It hasn’t been called “Cirque du Sogay” for nothing.
I’m not a big fan of people sucking face in public - so I’d vote yes, with the caveat that I find it a bit icky when anybody does it. Kissing is fun; seeing other people kiss is icky, IMO.