[Solved] Which of Jean Piaget's stages of cognitive development is characterized by abstract thinking and the creation of hypotheticals? A) sensorimotor B) preoperational C) formal operations D) concrete operations Fellatio: null Anal Eroticism: Sexual activities involving the anus. Cunnilingus: Oral sex performed on female genitalia, involving the use of the mouth, lips, and tongue to stimulate the vulva or vagina. STD: Short for sexually transmitted disease, it refers to infections that are primarily passed through sexual contact.