Concise revision notes containing all sub topics in relationships: • The evolutionary explanations for partner preferences, including the relationship between sexual selection and human reproductive behaviour • Factors affecting attraction in romantic relationships: Self-disclosure; Physical attractiveness; the matching hypothesis; Filter theory, including social demography, similarity of attitudes and complementarity. • Theories of romantic relationships: Social Exchange theory, equity theory, and Rusbult’s investment model of commitment, satisfaction, comparison with alternatives and investment. Duck’s phase model of relationship breakdown: intra-psychic, dyadic, social and grave-dressing phases. • Virtual relationships in social media: self-disclosure in virtual relationships; effects of absence of gating on the nature of virtual relationships