I also believe that sexual orientation more accurately depicts us but I also don't think it should be an issue if it was a preference. A few people mentioned that this is something used against us but in fact whether it's genetics or not, it should not matter.
To you're original question Hunter9, I'm in agreement with Alan95823. I think it's worth mentioning if you feel comfortable doing so and feel strongly enough about the use of the language "sexual preference". If there are any gay groups within the company (ie.. I'm part of CitiPride within my company Citigroup) you may want to bring this up to them and get their feedback.
I'm going to repeat so I don't get any hate mail, I believe it is an orientation not a preference!
Good luck with whatever you decide!