Known as an aphrodisiac, the Spanish fly is not a fly, but rather a species of what insect?

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Known as an aphrodisiac, the Spanish fly is not a fly, but rather a species of what insect?

https://www.youtube.com/watch?v=kq5ikhe9awo

https://www.threads.net/@heavyweightwriting/post/DGJxdGSz0HQ