Final answer:
J.M. Bailey and Pillard reported the number 52 in their 1991 study on the genetics of male sexual orientation, suggesting a genetic component to sexual orientation.
Step-by-step explanation:
The researchers who reported that 52 are Beaton and Mellor, Dorner, Sigmund Freud, and J.M. Bailey and Pillard. Beaton and Mellor, Dorner, and Sigmund Freud are not mentioned in the provided references. However, Bailey and Pillard conducted a genetic study of male sexual orientation and reported their findings in the Archives of General Psychiatry in 1991.
The researchers who reported the number 52 are J.M. Bailey and Pillard. They conducted a study that was published in 1991 in the Archives of General Psychiatry, which focused on the genetic aspects of male sexual orientation. This study is a significant contribution to the field of biology and genetics as it suggests the possibility of a genetic component to sexual orientation based on findings from a sample of twins and siblings.