Everyone who has ever hit on me has been of the same sex. The only people I have ever been kissed by were the same sex. This was on the face, not the lips, but still.
I laugh, blush and shrug when hit on, but the times I got kissed I cringed and resisted, but not in a negative way, why would I be negative? These are my best friends we're talking about, people I have highly regular contact with.
Most I've got from a girl was an ass-grab, but she was ass-grabbing all over the place, so it was hardly a compliment.