Yes there are Genes in the human Genome which influence human sexual orientation.
And yes hormones(Neurosteroids) change the epigenetic mechanism of the brain and body.
I am extremly suffering under my sexual orientation.
My face is the living truth, that sexual orientation has a biolocal explanation.
And btw I habe exome sequenced(80x) my Genome.
I also have full genome sequenced my genome(50x). And 3 times genotyped by 23andme.
There is 100% certain that biological there is some flawed in my case. Sexual orientation is neurobiological, genetic and or epigenetic organized.