The fact is that none of us can help our sins. I can no more help my lust than homosexuals can help theirs which is precisely why Jesus's forgiveness is the ONLY solution to the sin problem.
So people can say; "it's in the genes" Or; "we got our desires from monkeys' or an imgaginary beast called the common ancestor" or any story they want to make up to suit their itching ears. But the fact remains that sin exists and there is no rememdy for it except Jesus Christ. Amen.