Imagine two 13 year old virgins hooking uphaving sex with a very first time imagine how lame and boring that would be. Now dumb that down by 2x and that's vanilla sex.
A mysterious act or concept that nobody really knows about, but many claim they know how to do.
"Wanna know about Triple Vanilla Sex? Okay, take some vanilla ice cream, put all the weed inside, mix it all together, you take it, you get high, it's the craziest feeling ever."
"No, no, no, I know about Triple Vanilla Sex. It's when you're with your girl, and you take the Vanilla Ice Cream and you eat it all over each other."