Gladly.
I searched on "homosexual brain"
The section of the brain is called the anterior hypothalamus (AH) A specific neuron group in it called INAH-3 was studied.
Source 1 University of Chicago
Source 2 Boston.com, Health and Fitness
Source 3 New York University
The gist is, brains were disected. They had gay, straight male, straight female brains. The gay (AH) is half the size as a straight mans. The gay mans (AH) is about the same size as a straight females.
As a disclaimer, it has to be at least considered that the AIDS that all these gay men had
could have transformed their brain structure.