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