I think it more likely than not that sexual preference is "inherent". I hold a similar view about risk preference, animal sex preference and mobility preference. To me, the concepts "simple preference" and "inherent" seem orthogonal, yet you seem to be implying they somehow conflict. Could you explain?
If it turns out that risk preference or mobility preference is also "inherent", would that make Obamacare or mortgage subsidies/know your customer laws a violation of civil rights?