Suppose my preference for mobility is genetically informed. Does that mean "know your customer" laws are a violation of my civil rights? If sexual preferences turn out to be malleable by circumstances and are not genetic, would that make gay marriage restrictions acceptable? If not, then I don't see the relevance of genetic influences on human preference.
If you believe there is no fundamental principle preventing the state from regulating same sex marriage and the state merely needs a rational basis to do so, here is a very simple one. It incentivizes bisexuals to lean straight, thereby reducing the amount of gay sex and the transmission of STDs.
Note that I don't subscribe to the reasoning I just stated - that's just standard left wing political theory (which I don't agree with) applied to a scenario that left wing types refuse to apply it to.
If you believe there is no fundamental principle preventing the state from regulating same sex marriage and the state merely needs a rational basis to do so, here is a very simple one. It incentivizes bisexuals to lean straight, thereby reducing the amount of gay sex and the transmission of STDs.
Note that I don't subscribe to the reasoning I just stated - that's just standard left wing political theory (which I don't agree with) applied to a scenario that left wing types refuse to apply it to.