In my opinion it is very simple......
Most people in the RAF have an approach to sexuality that is the same as to almost any other subject - we generally don't care what you get up to, but don't want it forced upon us/rammed down our throat (I didn't pick that phrase on purpose - but in the same vein am not going to avoid using it in case I might offend somebody!).
The best similar example would be religion. There are some very religious individuals in the RAF, and that doesn't cause any issues whatsoever. However, if an individual were to try and force his religion on others, try to convert them, or mention it in every second sentence, then they will rapidly find themselves running out of friends. If someone, of whatever persuasion, wishes to make their sexuality an issue, continual subject for debate/discussion, they will rapidly find they no longer have an audience!