It has not been proven to be natural or biological. it could very well be a mental disorder...Why do we consider this notion clase closed. Pedophiles are known as mentally ill people. A lot of people that consider thmselves gay or bisexual have a history of sexual abuse...this is a fact....and why is it a fad for girls to be bisexual. I heard something like 35% of girls 18-21 consider themselves bisexual in US colleges. I don't pass judgement on homosexuals ..I'm just asking why can't I question it?