I take a lot of "abuse" at my job. My patients hit me, throw poop on, at or near me. They do the same with food, and sometimes even other sorts of bodily secretions, although rare, but it has happened. They kick me, trip me, and call me every name in the book plus some I have never heard of before, oh, and they also grab my hair and my tits, and slap my ass, ALL of which I usually either laugh off, or will say something like, "well now, you can do better than that can't you? Aim higher next time." Or I might say something like, "now Mr. Smith, your wife wouldn't like you touching me there, and I know my boyfriend wouldn't either."
But, when one of them spits at me, on me in my general direction, or if one of them happen to have good enough aim to spit in my face, it makes me instantly very pissed off to the point that I will have no choice for my patients safety, mind you, for me to completely and totally walk away from them. I make sure they are safe first of course, but then I walk away and go and cool off for a period about long enough for me to smoke.
Spitting on me is in my opinion the absolute most degrading and insulting thing to do to me, not to mention totally gross. It makes my blood boil with a sure fire quickness.
So, I can honestly say, someone spitting in my mouth would not be a good idea, or suggesting I do that to them either. NASTY. Now, I will spit on my hand or on his dick as lube prior to doing sexual things to him, but that's totally different. I will drink after him, and him after me, and we french kiss too a lot, but again, in my opinion, totally different things.
Oy Vey and a big Hell No to the spitting in each other mouths.