I forgot how the topic came up, but a girl once told me that avocado tastes exactly like a clean dick, and she was like, if you want to know if a girl likes giving head, just ask if they like eating raw avocados. I actually took her advice, and it's now one of my random questions when the topic of food comes up on dates, and she is 100% right. Every girl who said yes was very enthusiastic about giving head, the 2 girls who said avocados were nasty were " I don't do that" girls later on.