"we" abusive relationship addiction adolescence adult attachment affection age age-gap aggression alcohol alternative relationship types alternatives announcements anxiety apologies app arguing arousal attachment attachment anxiety attitudes attraction attractiveness attribution autonomy avoidance bachelor/ette beauty benefits of relationships betrayal birth control pills bisexuality blended families body body image book brain breaking up breakup breast capitalization casual sex celebrities cell phones charts cheating cheating/infidelity chemistry children china classic study close relationships closeness cnn cognition cohabitation college commitment communal communication compatibility competition condom usage conferences conflict conflict resolution consensual non-monogamy consumer behavior contrast effect control cooperation coping correlation ≠ causation cortisol counseling couples courtship creeping cross-sex friendship crush cuddling culture cybersex date ideas dating dating 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