Does the red tide count? I went to see a provider once who told me Aunt Flo had just left town so I should try when I was going down to daty. I didn't listen, so when I got down there I got a whiff of the distinct smell just as I dipped a finger in. I pulled it out and it turns out Aunt Flo wasn't quite gone yet. She was obviously embarrassed, but I was already naked and ready to smash.
Those jokes about blood being a good lube are true, she felt super wet.