On the cheek yes. Lips? I need to get to know him a little more for that. I'm a little germ-phobic , and I can't just go and kiss a man until I have had at lease one conversation about his STD history...
ETA: I didn't kiss my current SO until I saw the results of his latest HIV test, and assessed him for a history of cold sores, fever blisters, and other things of the sorts. I guess it's the nurse in me. He looked at me like I was crazy, but I told him, "I just don't go kissing people. Never had mono, a cold sore, or fever blister in my life, and I don't plan on starting." He laughed, called me a nerd, and kept it moving. If he'd had problem with my line if questioning, then I would have scratched him off my list.