- common-law- not legally married, living together for a certain number of years.
             - legal marriage- married by priest or judge, recognized by government in all states
             - polygyny- one husband has two or more wives
             - polyandry- wife has two or more husbands (up to five).
             . In 1990, 28% of US births were to unmarried women. By 1995, this figure had increased to 32%.
             - gender is the social and psychological characteristics associated with being male or female.
             - sex is the biological distinction between being male or female.
             . Gender roles are learned through interaction with the environment, not through biology.
             . The Cognitive-developmental theory of gender role development reflects a blend of biological and social learning views. Biological readiness, in terms of cognitive development, of the child influences how the child responds to gender cues in the environment.
             . Sternberg's triangle of love-
             - intimacy- disclosing personal feelings
             - commitment- decision to maintain love relationship with partner
             - eros is erotic, consumed by passion and romance
             - mania love feels intense emotion and sexual passion but is out of control
             - storage is calm, soothing, nonsexual love devoid of all passion
             - agape is selfless and giving, expecting nothing in return.
             . 67% of 620 never-married college students reported that they would divorce if they fell out of love with their spouse.
             . 41% of adults in US age 25-29 reported that they had over 5 partners since age 18, in contrast to 26% between the ages of 18 and 24 who reported that they had had over 5 partners.
             - Here and now- partners who have an emotional/sexual relationship and want to live together becau
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