Fill a small baloon with a drink of your choice, freeze it. Insert it into the rectum with the tied end exposed. Have vaginal sex with the woman ontop. Usually preceeds a Surprise Spring.
After intercourse, or during, when the iced drink has melted, pierce a hole in the exposed part of the balloon and the guy/girl drinks the fluid that "springs" from the anus.
I enjoyed playing in my girl's" Ice Palace Jam" last night, but particularly enjoyed the "Surprise Spring" I drank out of her ass!