While the defining characteristics of femininity are not universally identical, some patterns exist. Gentleness, empathy, sensitivity, caring, sweetness, compassion, tolerance, nurturance, deference, and succorance are behaviors generally considered feminine.
Femininity is sometimes linked with sexual objectification and sexual appeal. Sexual passiveness, or sexual reception, is sometimes considered feminine while sexual assertiveness and sexual desire is sometimes considered masculine.
Ann Oakley's sex/gender dichotomy has had a considerable influence on sociologists defining masculine and feminine behavior as regulated, policed, and reproduced in our society, as well as the power structures relating to the concepts. Some queer theorists and other postmodernists, however, have rejected the sex (biology)/gender (culture) dichotomy as a "dangerous simplification".
An ongoing debate with regards to sex and psychology concerns the extent to which gender identity and gender-specific behavior is due to socialization versus inborn factors. According to Diane F. Halpern, both factors play a role, but the relative importance of each must still be investigated. The nature versus nurture question, for example, is extensively debated and is continually revitalized by new research findings.Some hold that feminine identity is partly a 'given' and partly a goal to be sought.
In 1959, researchers such as John Money and Anke Erhardt proposed the prenatal hormone theory. Their research argues that sexual organs bathe the embryo with hormones in the womb, resulting in the birth of an individual with a distinctively male or female brain; this was suggested by some to "predict future behavioral development in a masculine or feminine direction". This theory, however, has been criticized on theoretical and empirical grounds and remains controversial. In 2005, scientific research investigating sex and psychology showed that gender expectations and stereotype threat affect behavior, and a person's gender identity can develop as early as three years of age. Money also argued that gender identity is formed during a child's first three years.
Mary Vetterling-Braggin argues that all characteristics associated with femininity arose from early human sexual encounters which were mainly male-forced and female-unwilling, because of male and female anatomical differences.Others, such as Carole Pateman, Ria Kloppenborg, and Wouter J. Hanegraaff, argue that the definition of femininity is the result of how females must behave in order to maintain a patriarchal social system.
In Carl Jung's school of analytical psychology, the anima and animus are the two primary anthropomorphic archetypes of the unconscious mind. The anima and animus are described by Jung as elements of his theory of the collective unconscious, a domain of the unconscious that transcends the personal psyche. In the unconscious of the male it finds expression as a feminine inner personality: anima; equivalently, in the unconscious of the female it is expressed as a masculine inner personality: animus.