The most famous and widely accepted theory of psychosexual development is Freud's theory of psychosexual stages.
Here's a breakdown of Freud's stages:
* Oral Stage (birth to 18 months): Focus on the mouth for pleasure (sucking, biting, chewing). Fixation at this stage may lead to oral habits like smoking or overeating.
* Anal Stage (18 months to 3 years): Focus on bowel and bladder control. Fixation can lead to anal retentive (neat, organized) or anal expulsive (messy, rebellious) traits.
* Phallic Stage (3 to 6 years): Focus on the genitals and the Oedipus or Electra complex (desire for the opposite-sex parent and jealousy of the same-sex parent). Fixation can lead to sexual problems or difficulty with intimacy.
* Latency Stage (6 to puberty): Sexual feelings are repressed, and focus shifts to social and intellectual development.
* Genital Stage (puberty onward): Reemergence of sexual interest, directed towards mature relationships.
Please note: Freud's theory is controversial and is not universally accepted by all psychologists.
If you have any other questions about psychosexual development or other psychological theories, feel free to ask!