I totaly can not handle anyone touching me when I am not prepared for it. If someone jumps on my back while I'm minding my own bussiness, that person is likely to be knocked out within a minute. I just like, swing my arms in the general direction, usualy with the result of knocking someone in the head
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Same with kisses. I don't mind the three cheek kisses (it's a normal greeting here in same cases as well) if it's with a person I know closely. For instance, I greet my brotehrs girlfriend that way, I greet my sister that way. But I'm not going to cheek kiss anyone I just met for 2 seconds.