[Mazda3Fan]

"First, unless they are doing it public, the military has no way of knowing." Then lets just keep the gay sex a secret and everything is hunky dory.

[Lucky Dog]

Then lets just keep the gay sex a secret and everything is hunky dory.

That is, I believe, known as "staying in the closet." Unfortunately, from a security risk perspective, queers are neither content to confine themselves to a single, or even a few partners, nor able to be discreet about their activities. Consequently, these people are still subject to blackmail.

Furthermore, as a generality, unlike the example you cited earlier with a spouse, few queers have any loyalty to the partner in the activity. If such were the case, then there would be very little problem with queers being "outed," would there?

Finally, there is still the problem of the queer disease risk. Blood borne pathogens are a very real threat in a battlefield environment. There is enough threat from enemy action without adding to it with preventable sources.