Gay rights aren't predicated on being born gay or having the right gene. Gay rights are predicated on having choice and consent. If you're a man and you can find another man that consents to have sex with you, it's the consent that gives you the right to have sex with him. Genetics are irrelevant when it comes to sexual rights. Just as gay rights are based on choice and consent, so are prostitution rights. All sexual rights are based on choice and consent.