In a study examining over 900 men and sexual orientation discussed in Module 15,the only factor related to having a homosexual orientation was:
A) the presence of a hormone among homosexual men that is not generally found in straight men
B) different EEG readings for the majority of homosexual males
C) having several older biological brothers
D) differences in MRI scans in the hippocampus among homosexual males

Question

Quizplus · Accepted Answer

The study found that having several older biological brothers was the only factor related to having a homosexual orientation. This phenomenon is known as the fraternal birth order effect, and it suggests that prenatal factors may play a role in sexual orientation development. The other options (A, B, and D) were not supported by the study discussed in Module 15.

In a Study Examining Over 900 Men and Sexual Orientation