Typically, I kiss them on the forehead. In fact, they have been trained kind of so that when I bend down with my lips puckered, they know to raise their heads up to the kiss!

However, at night, Weezie will come up to me and "kiss" (lick) me on the lips and I don't mind it at all. My husband used to complain about that, because they would lick their butts but I just told him, hey, I know plenty of people who lick their butts too if they could twist like that to do it!