Evolutionary fitness

Polygamy

Polygyny

Polyandry

Monogamy

Sexual choosiness

Sexual dimorphism

Biological basis of monogamy

Oxytocin

Dopamine

Sociometer theory

Harlow's monkeys

Attachment theory

Imprinting

Adult attachment

Attachment styles

Secure attachment

Anxious ambivalent

Avoidant

Self expansion theory

Interdependant theory/investment model

Commitment

Reward/cost ratio

Companionate love

Passionate love

Positive illusions

Cooperative dilemmas

What couples do well

Novel experiences

Why relationships fail

Neurochemical basis of rejection