Penetration - Sexual activity involving something (typically a penis) being inserted into an anus or vagina.
Porn/Porno/Pornography - Video or images depicting sexual acts for the purposes of other individuals to view during masturbation.
Pornstar - An actor who specilizes in making porographic content.
Pupplay - Roleplay wherein an adult acts like a dog/puppy. Can be done with other consenting adults (who may or may not also act like dogs) or solo. May involve accessories such as masks, leashes, harnesses, etc.