Junk food is loaded with chemicals and preservatives that pollute your body and can contribute to bacterial imbalance. The same goes for fried foods.
Can a coochie ever really taste like a cupcake? Um, no, it can't, and your partner shouldn't expect it to. After all, anyone's who's got their face in your crotch probably isn't seeking out a snack. So think of a fancy crotch diet like dabbing on some cologne; it's something you can do to please your partner, or they can take you as you are. Either way, as long as you're clean and healthy, your sexual juices should taste just fine.