I'll go further though, there's always risk at work when you talk about your romantic life at work or act in a manner that isn't socially acceptable or palatable.
The argument still comes back to choices (not being gay, the choice to behave a certain way)
If I talk about my GF (or even if we're just seen out), I run the risk of making people not like me and them holding something against me.
If I dress in a manner that isn't acceptable for my work (whether effeminate, gangsta, sporty, nerdy, etc), my coworkers will like me less and I'll lose sales or get fired.
If I talk a certain way (whether a lisp, a stutter, etc.; granted this isn't a choice but there's coaching available and plenty of sources to work on speaking skills), my coworkers will like me less and I'll lose sales or get fired.
Like I said, life sucks. There's no fair way to address these things unless social acceptability changes.
I would cite regulation, but I know you will simply ignore it.
