I have a part-time job which is in a very gay environment (no, I don't work in a bar, hair salon ... or Bloomingdale's). But there are some straight web developers who work there as well, one of whom I have a crush on. And I think he flirts back. We're able to carry on our light flirtation because I can talk to him about sports. Sometimes I think I outdo him with my knowledge, especially when it comes to baseball.
Even when we aren't chatting, my work space is within earshot of his so I can hear his soothing voice, that has a hint of an Indian accent, throughout the day. Last week as we talked about the NCAA Basketball Tournament he leaned back in his chair with his arms behind his head which afforded me a view of just a little bit of pit hair - such a cock tease. Sometimes he wears black-rimmed glasses which gives him the look of a model from a fashion layout in GQ. Since he sits near the printer, which I use constantly for scanning documents, I'm always thinking of sports topics with which to engage him.
This is all done with absolutely no expectations of anything further. And as long as we stick to sports chit chat there's not a chance it can be misconstrued as anything improper. Now if he'd only return the favor and talk to me about Broadway musicals!