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2. Sex differences in human physiology - Wikipedia

   en.wikipedia.org/wiki/Sex_differences_in_human...

   [83] [84] Comparing a male and a female of the same body size, an average difference of 100 grams in brain-mass is present, the male having the bigger and heavier brain. This difference of 100 grams applies over the whole range of human sizes. [86] [87]

3. Testosterone - Wikipedia

   en.wikipedia.org/wiki/Testosterone

   Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate , as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair .

4. Bed size - Wikipedia

   en.wikipedia.org/wiki/Bed_size

   Standard North American bed sizes An American hotel room with two queen-size beds. The sizes of mattresses use non-numeric labels such as a "king" or "full", but are defined in inches. Historically most beds were "twins" or "doubles" but in the mid-1940s larger mattresses were introduced by manufacturers.

5. List of human hormones - Wikipedia

   en.wikipedia.org/wiki/List_of_human_hormones

   5-DHT or DHT is a male reproductive hormone that targets the prostate gland, bulbourethral gland, seminal vesicles, penis and scrotum and promotes growth/mitosis/cell maturation and differentiation. Testosterone is converted to 5-DHT by 5alpha-reductase, usually with in the target tissues of 5-DHT because of the need for high concentrations of ...

6. Androgen - Wikipedia

   en.wikipedia.org/wiki/Androgen

   A study using male rats showed that testosterone may block social isolation, which results in hippocampal neurogenesis reaching homeostasis—regulation that keeps internal conditions stable. A Brdu analysis showed that excess testosterone did not increase this blocking effect against social isolation ; that is, the natural circulating levels ...

7. Human sexuality - Wikipedia

   en.wikipedia.org/wiki/Human_sexuality

   There is considerably more evidence supporting innate causes of sexual orientation than learned ones, especially for males. This evidence includes the cross-cultural correlation of homosexuality and childhood gender nonconformity, moderate genetic influences found in twin studies, evidence for prenatal hormonal effects on brain organization, the fraternal birth order effect, and the finding ...