A person might have an endocrine condition that pre-disposes him to be a little more quick-tempered than the average Joe. If it is genetically based, he was born that way. If he decides that he doesn't like Arty and the next time he feels an angy impulse he's going to punch him, that's a choice. Todd might have a hormonal condition that pre-disposes him to be a little more risk-taking or find a little more stimulation in sexual contact. If it is genetically based, he was born that way. If he decides in his mind that the next time he feels an impulse he's going to ignore females and pursue a homosexual guy who is much easier to obtain, THAT...IS...A...CCHHOICEEEE!