I specialise in GFE so french kissing is my thing. Also I love to kiss and if I don't kiss them I don't really enjoy the rest!
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+4 i cant see how someone can suck a guys cock but not kiss so its each to their own i guess
I can totally understand it; a man can wash, scrub & thoroughly rinse his penis so that it's just clean skin, but they can't do that with their mouths! I've encountered far more stinky mouths than willies, and having a big tongue coated in fetid, thick saliva plunged into your mouth is mildly traumatic at best. With an "oh my god no way"-type penis, covered oral is always an option but kissing is pretty much a yes/no issue so can be a bit more stressful.
That said, if a client has a clean mouth and kisses gently with his lips (as opposed to just sticking his tongue right out and/or licking my face and/or drooling a lot) then of course that's really fine and I wouldn't personally see a difference between that and any other service I'm happy to offer.