We have no laws - either constitutionally or by statute which proscribe any persons 'preference' for anything. There are some civil laws which prohibit certain types of sexual 'activity' outside of marriage, but they are generally no longer enforced. In all, no civil laws deny the right to just 'think' anything.
Laws only govern actual conduct.
Thus, it is a civil right to think, to ponder, to prefer, etc. This is imbedded in the inalianable right to 'liberty' in the American constitution. We also have the same right granted to us by God. It's called 'agency'. If we exercise that right by making the wrong choices-then we get into trouble with God.