Psychosexual Stages (by Freud)
1. Oral Stage (0-18 Months) - infant's source of id gratification is the mouth
2. Anal Stage (18 Months - 3 Years) - conflict between id and superego, control of bodily functions
3. Phallic Stage (3-6 years) - genitals become the primary source of pleasure, development of sexual attraction to the parent of the opposite sex
4. Latency Stage (6-11 years) - sexual interest is relatively inactive, sexual energy is going through the process of sublimation