I've never gone down on a chic, but I've been told by many people that it tastes like salmon or clams.(salmon if she's clean, clams if she's a dirty hoe who never washes down there) Although, if they have just showered, you should barely taste anything.
I would just be honest with them. It's no good perpetrating and making yourself out to be something you're not. The jack'll come out the box eventually, and they'll all know. Never cry wolf. If you want to know what pussy tastes like, go and get some.
I mean, shit, the reason I never went down on a chick, and I'm only telling you this so you'll learn something, is because I lost my virginity to a prostitute that my boss paid to fuck me, and didn't wanna get an STD. Of coarse, I don't tell everyone this for obvious reasons, but I never lie about having eaten pussy. It's not becoming. Think of it like bragging rights among men: you have to earn your bragging rights. It's a sign of respect. Lying and perpetrating shit will get you dissed on.