Full on groping and tongue just ain't pretty no matter who is doing it.
You & I SO don't go to the same parties
I just want to say, I'm so impressed this thread is still open, unlike so many similar threads, and that's of course due to everyone being respectful and mature about the subject matter. Hope I didn't jinx it.
I'm a "breeder" though a fairly liberal one - a Friend of "Friends of Dorothy" if you prefer.
And it's not uncommon to see same-gender hand-holding or small, tender PDA be it at home (Jersey shore) or at work (NYC). And like most folk here, as long as it's not over-the-top groping - if it's a level of affection I could expect to see in a PG-rated movie, I couldn't care less. That may be a good rule of thumb, the PG rule of thumb. If you are a parent, or can imagine being a parent of a small impresionable child, how much physical displays of attention/loving/liking between ANY two consenting adults (or more :lookaroun ) would you feel comfortable letting that wee one see? And then, to quote the wise sage, always let your conscience be your guide.
I'd like to tell you to not worry about anything, but I'm not completely naive. You never know who's going to be around, and what kind of sticks they have up their butts. Some folks just don't have the "live and let live" chromosome in their DNA, and may have no compunction against approaching two men even doing something as benign as holding hands or leaning a head on a shoulder.
If I may offer a bit of advice. If someone thought it was within their rights to get up in your face for innocent PDAs, I'm sure they're hoping for a big old altercation, a shouting match. Go the opposite way. Act as if you're having the friendliest conversation ever. In fact, be so cordial that they don't even know how to keep yelling at you. Not only will it take the wind out of their sails, but if there's anyone else around who's a little too shy to "be themselves," you just may provide the impetus.
Oh, and have fun.