(NSFW) Is it common to associate sex with food?

@camertron and I were just talking about some of the iconic Fluther questions, and I showed him the pancakes thread. Which is hilarious… if you haven’t seen it, go now! Then come back. Pretty please. Seeing how “pancakes” has come to mean “sex/orgasm” on Fluther, he mentioned that he and some high school buddies had a similar inside joke using “sandwiches”. That reminded me that I had one, too… “baking a cake”. Another jelly’s code word is “cookies”. Why are they all food related? Is it just a coincidence, or is this a common occurrence? What are your code words? Share the origin of your word(s), too, if you like!