There is some validity to the belief that we are oriented to individuals one at a time. Some are one attraction almost all the time with only one person they love outside of that. Melissa Etheridge was married to a straight woman who loved her but mostly men. This is different from bisexuality. There appears to be a continuum from people who are only what they are told to be (even if they are not) to people wholove who they will. Still, those patterns are probably biologically set. The sin is trying to be what you are not, which is why reparative therapy is classed by most legitimate doctors as assault.