Sexual vs. punishment spankings

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I think it's strange how I really hate punishment spankings (like from my dad) but sexual spankings (from my girlfriend) feel so good.
Do other people think it's wierd that one thing can be both a painful punishment that can make you cry and a sexual thing that can make you horny, depending on who does it and how?

Of course, it's perfectly natural.
With your girlfriend pain turns into pleasure!
Don't spank her if she doesn't want to, though...