ized according to the gender of their preferred sex partner: heterosexuals prefer partners of the opposite sex, homosexuals prefer same sex partners, and bisexuals are attracted to any sex. Hence, human sexual orientation does not depend on what a person does, but rather it depends on who they do it with (2:307 308).
Investigators trying to find the source of these differences have often looked to the brain (3:51). It has been postulated that the brain is a "mosaic of areas that may respond to sex hormones at various times during early development" (1:51). According to some researchers, both the timing and the magnitude of various hormone levels could determine a person's sexual orientation.
In recent years, a number of highly controversial studies have drawn attention to an area of the brain known as the hypothalamus. The hypothalamus is a small structure which occurs at the brain's base. Its many cellular nuclei and fiber tracts are responsible for autonomic nervous and endocrine system function. For example, hypothalamic h
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