I just have a question about being gay?

no it is not true, what your friend would be referring to is the fermentation of the brian of a male this is what causes someone to be ed. being gay, is genetic and it is hereditary meaning you do p it on but you can have a gene and not be affected by it. Like eye color how two brown eyed parents have can have a blue eyed child and then that blue eyed child can have one with brown eyes. It's the same with ual orientation.