Imagine we identify a gene that is directly responsible for the effects of vasopressin on male mammals, including humans—we will call it trust1—that leads to the production of a vasopressin receptor in the brain, which we will call TRUST1. There are different versions of trust1, all of which lead to different levels of the behavior associated with this neuropeptide on male behavior. Give some examples where it would be a good idea to know a particular male’s genotype—that is, which of the trust1 genes he has. Give an example of when you think science has gone too far and this information should not be known.