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The one-sex and two-sex theories are two models of human anatomy or fetal development discussed in Thomas Laqueur's book Making Sex: Body and Gender from the Greeks to Freud. Laqueur theorizes that a fundamental change in attitudes toward human sexual anatomy occurred in Europe in the 18th and 19th centuries.
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
From conception to death, but particularly before adulthood, females are generally less vulnerable than males to developmental difficulties and chronic illnesses. [ 141 ] [ 142 ] This could be due to females having two x chromosomes instead of just one, [ 143 ] or in the reduced exposure to testosterone.
Prenatal thyroid theory of same-sex attraction/gender dysphoria has been based on clinical and developmental observations of youngsters presenting to child psychiatry clinics in Istanbul/Turkey. The report of 12 cases with same-sex attraction/gender dysphoria born to mothers with thyroid diseases was first presented in EPA Congress, Vienna ...
Gender, on the other hand, is the social and psychological sense one carries of being male, female or any of the multitude of gender identities said to exist outside of the conventional ...
44% will have a conception ending in a live birth within one year 64% will have a conception ending in a live birth within four years [ 13 ] According to a study done on a sample of 782 healthy European couples ages 19–39, fertility starts declining after age 27 and drops at a somewhat greater rate after age 35.
In girls, gender nonconformity comprises dressing like and playing with boys, showing interest in competitive sports and rough play, lacking interest in conventionally female toys such as dolls and makeup, and desiring to be a boy". This gender nonconformist behavior typically emerges at preschool age, although is often evident as early as age 2.
Robert Stoller, whose work was the first to treat sex and gender as "two different orders of data", in his book Sex and Gender: The Development of Masculinity and Femininity, [46] uses the term 'sex' to refer to the "male or the female sex and the component biological parts that determine whether one is a male or a female". [47]