Whatever the reasons might be, homosexuality is buried deep in the genome of not only humanity, but also in the animal kingdom, so it must be part of the design for a reason. For example, homosexuality is tied to the set of genes controlling family fecundity. Fecundity means to be capable of producing an abundance of offspring. In other words, families with genes to produce many children that survive, also carry the genes for homosexuality. This helps perpetuate homosexuality, despite the fact that most homosexuals do not produce offspring. A propensity to produce homosexual boys is passed down on the X -chromosome, the female side only, from mother to daughter.