Research evidence indicates that two biological factors are most likely to influence a person's sexual orientation. These are

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Research has shown that prenatal hormonal exposure and heredity are the two biological factors most likely to influence a person's sexual orientation. Prenatal hormones can affect the development of sexual orientation during critical periods of fetal development, and genetic or hereditary factors have been suggested by studies of family and twin populations.

Research Evidence Indicates That Two Biological Factors Are Most Likely