Where do crazy/dumb sounding sexual terms come from?

Anyone know? There are a ton of oddly named sexual terms out there. Like, where does the name “Boston Pancake” come from? Or “cream pie”? How do these things originate?

A lot of them originated in the porn industry, and then were popularized via so many people watching porn and reusing the words/phrases. Some have a rather robust history that dates back a considerable amount of time, however.

I would think “cream pie” would be fairly obvious, whereas Boston Pancake…who knows? lol