Why would anyone think kissing isn't cheating?

Several years back, I knew someone that thought only sex and other sexual acta was cheating but not making-out.

He didn't consider kissing as too much of a big deal. He didn't think kissing counts as infidelity just because the person didn't share their bodies with others.

Why would anyone think like that? If someone was in a relationship or married, even if it was only kissing, isn't that betrayal too?

Why would anyone think kissing isn't cheating?
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