I spent 4 years in active in the NAVY and 8 years in the Reserve. I think there could be problems with either gender if say they put openingly 'hetero' folks mixed in together. It's not that every man and woman is attracted to each other in close quarters, but, it would cause problems on a whole host of levels. This is why genders are kept separate in the Military.
The subject at hand would present some of the same problems and that is why it's being debated. Sure, there are always people who hate others based on sex, gender and race, but, when one states that they are hetero-sexual, usually goes without saying, or Homo-sexual, it will create a problem if they are in close quarters.
I knew gay folks in the Military and one lady, who happened to be lesbian, we became friends and we even joked around that liking women is something we have in common. :-) I wouldn't want her or any brave, honorable American to lose their career in the Military solely on the basis of being found out as gay or lesbian.
My solution, like President Obama's tax compromise, won't make anyone happy, but, may be the only one at this time. Drop DADT, and base it all on behavior for everyone. I would also start an intergration, the final bias, of the genders. There is no reason male and females are separarted and true equality should have no bias.
I would be surprised, even if the rule is dropped ,that anyone would come out to many folks, since most folks are not gay or lesbian. But, it would be the height of hypocricy and probably illegal, if the DADT law was dropped and they military or any govt. run agency still separated based on gender. The latter would be hetero-phobia and I'm sure all those in favor of dropping DADT, me included, would be just as in favor of dropping gender bias across the board.