- attachment: psycological bond that forms between infant and the mother, father, or other caregiver
- equity theory: people mentally calculate benefits and costs from a relationship; act to restore equity
- gender-segregated (homosocial): children play with only same gender (8-12) years
- hysterectomy: surgical removal of the uterus
- oopherectomy: surgical removal of the ovaries
- Peggy Lee syndrome: feelings of disappointment after first intercourse by teenage girls
- prostatectomy: surgical removal of the prostate
- serial monogamy: intention of being faithful, but relationship is of uncertain duration