At the record store, Tammy has been avoiding Tony's advances; she calls Lisa who joins them at the record store. Lisa offers Tony "anything" and she begins to fellate him, then Tammy joins in, and he ejaculates on Tammy's breasts. Debbie dresses as a "Texas Cowgirl" and goes to see Mr. Greenfield after hours at the store. She fellates him, he then penetrates her vagina with his finger and performs cunnilingus on her. Then they engage in sex, first in the missionary position, then doggy style, and then with Debbie on top. They finish in the missionary position before Mr. Greenfield ejaculates on Debbie.
Taken from Wikipedia.