24/7: A relationship in which protocols are in place continuously.
Animal transformation fantasy: Fantasy in which the focus is on the sub entering the altered mindspace of a different species, typically a dog, pony or horse.
Abrasion: Using something rough (such as sandpaper).
Aftercare: The time after a BDSM scene or play session in which the participants calm down, discuss the previous events and their personal reactions to them, and slowly come back in touch with reality. BDSM often involves an endorphin high and very intense experience, and failure to engage in proper aftercare can lead to subdrop as these return to more everyday levels.
Ageplay: Usually referring to daddy/daughter or mommy/baby role play. Does not usually include or imply aspects of incest, but rather the nurturing relationship of parent/child or......