The first girl i ever went down on, tasted something a lot worse than period.
Period taste can be easily deciphered logically by your taste buds, but what she had was very different.
If I was about to go down there and she either was on her period or just got finished playing full-court basketball, any woman I know would be pulling my head back up and telling me, "Oh noooo, not today."
That would be like me running a coupla miles in 85 degree weather and then coming back home asking wifey for a bj....sweaty pubicks, balls, and all.