A fork of Rural Dictionary
Scientific: When a man inserts his penis into a woman's vagina, and begin coitus. Within minutes of insertion, both are tired and stop intercourse, realizing that rather then the intercourse taking hold it has slipped away. Laymans Terms: It is the opposite of sex that sticks. It doesn't take hold, or stay with you. Ergo, rather then the sex sticking, it doesn't stick.
Bob and Sally are having sex Bob: "Oh Dear God! This sex isn't sticking" Sally: "What do you mean its not sticking?" Bob: "Its like sex that sticks, but it doesn't" Sally: "Oh My, so thats Sex That Doesn't Stick."