Why does a cats butt go way up in the air when you scratch them by the base of their tail?

I'm genuinely just curious, at first I thought it might be because that's what they do when they mate, but even male cats will raise their butt up too so is their a specific reason or no?

submitted by /u/agentprimus
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from Pets https://www.reddit.com/r/Pets/comments/d662yg/why_does_a_cats_butt_go_way_up_in_the_air_when/