OTP is another one, as in One True Pairing, or the "ship" you read the most.

In LOTR I was fond of Sam/Rosie/Frodo, and people often called it their OT3. *lol* Unfortunately there wasn't enough good fics in that threesome, and very few that were both graphic and good. Pretty Good Year is a novella-length fic with that group that's very good, but rarely gets into the physicality of the relationship.