1. Human Relationships Unit: Interpersonal Relationships Learning Objective: Analyze why relationships may change or end

2. Why relationships change or end Infidelity http://www.youtube.com/watch?v=KG3oMlDhc rwhttp://www.youtube.com/watch?v=KG3oMlDhc rw http://www.ted.com/talks/lang/eng/helen_fishe r_tells_us_why_we_love_cheat.htmlhttp://www.ted.com/talks/lang/eng/helen_fishe r_tells_us_why_we_love_cheat.html

3. MHC genes are too similar http://www.scientificamerican.com/article.cfm?id=birth-control-pills- affect-womens-tastehttp://www.scientificamerican.com/article.cfm?id=birth-control-pills- affect-womens-taste Social exchange theory (Kelley and Thibaut, 1959) http://family.jrank.org/pages/1595/Social-Exchange-Theory-Major- Contemporary-Concepts.htmlhttp://family.jrank.org/pages/1595/Social-Exchange-Theory-Major- Contemporary-Concepts.html Based on cost-benefit analysis where cost of relationship must not outweigh the benefits Equity theory (Walster, 1978) social http://www2.hawaii.edu/~elaineh/42.pdf Equality is important in maintenance of fidelity Individuals who feel deprived or under-benefited are more likely to cheat than individuals who feel fairly treated or over-benefited (Hatfield, 1979)

4. Fatal attraction theory (Felmlee, 1995) http://www.helium.com/items/171662-the-make- or-break-theory-of-fatal-attractionhttp://www.helium.com/items/171662-the-make- or-break-theory-of-fatal-attraction Factor that caused initial attraction is also responsible for its ultimate demise A musician that lives freely and day-to-day is initially attractive but long-term his partner may view him as undesirable to settle down with