I would share your comfort level as well generally speaking. I am a little caught off guard when I see couples really getting into it, but I recognize it is my own conditioning. Crazy how these values can be implanted into us. I expect that if I grew up in Paris, heavy kissing would not even phase me. The sad reality is if we observed every cultures etiquettes at once, we would be almost completely unable to move or live. As we become more global as a species, it seems like we all have to accept in order to get along. I live in Vancouver and I see all sorts and have become to accustomed to most things including men kissing or holding hands. Once you accept, you feel more accepted.