Heteronormative: the belief that heterosexuality is the norm. It assumes that sexual and marital relations are only between people of opposite sexes.
Monogamy: when you are married to, or in a sexual relationship with, one person at a time.
PiV: shorthand for "penis in vagina" sex, ie. vaginal intercourse.
Sex education: From Wikipedia: Sex education is the instruction of issues relating to human sexuality, including emotional relations and responsibilities, human sexual anatomy, sexual activity, sexual reproduction, age of consent, reproductive health, reproductive rights, safe sex, birth control and sexual abstinence. Sex education that covers all of these aspects is known as comprehensive sex education. Common avenues for sex education are parents or caregivers, formal school programs, and public health campaigns.