It depends, usually I think "get a room", especially about hi school couples slobbering over each other (ewww). But if it just looks like gentle affection w/o drooling & you don't try to pull me into it, I don't care.
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Balance is needed within the universe, can be demonstrated in most/all concepts/things. Black/White, Good/Evil, etc.
All dependent upon your own perspective in your own form of existence, so trust your own gut and live the way YOU want/need to.