Peanut Butter Gulag
Apply a healthy layer of your favorite peanut butter to the inside of your partners asshole, then have vigorous anal sex until they prolapse. Upon prolapse, pull out and enjoy the warm gooey Siberian treat.
My girlfriend came back from a BDSM convention and told me about the Peanut Butter Gulag; it was great until I learned that I was allergic to peanut butter.