A male is more likely to be homosexual if he
A) is an only child.
B) has an older sister.
C) has a younger brother.
D) has several older brothers.

Question

Quizplus · Accepted Answer

Research has shown that the presence of older brothers increases the likelihood of a male being homosexual. This is known as the "older brother effect." It is thought to be related to changes in the mother's immune system after each male pregnancy, which can increase the likelihood of a male fetus developing a certain type of brain anatomy that is associated with homosexuality. Other factors, such as genetics and early childhood experiences, may also play a role.

A Male Is More Likely to Be Homosexual If He