If you're crushing on a colleague, you're not alone: A CareerBuilder.com survey found that 40 percent of workers have dated someone on the job during their career, proving that it's a hookup hot spot, albeit one with parameters. Just coupled up with a coworker like Glee costars Lea Michele and Cory Monteith or are thinking about making a move? Check out our advice for turning a flirtation into a potential relationship.

TESTING THE WATERS
It's a good idea to suss out whether your work crush has the hots for you too. Some tip-offs: If he starts hanging around your work space a lot or asks you to grab lunch or after-work drinks, says Stephanie Losee, coauthor of Office Mate.
It's also promising if he's in an unrelated department yet asks your opinion on a project of his — it indicates that he is looking for an excuse to talk to you and values your opinion, notes Losee.
You can do your own digging by jokingly saying, "Everyone thinks we're seeing each other, ha-ha. Crazy, right?" If he casts a wide grin or seems into the idea, the coast is clear to start flirting and see what happens.

AVOID GETTING BUSTED
Once you've gotten together (we know you'll get this thing moving), keep that info on the DL. "If it turns out to be a two-week fling, nobody needs to know about it," says Helaine Olen, coauthor of Office Mate. And monitor how often you bring him up. Olen says coworkers often guess something is going on when one person mentions the other too frequently. For example, "Here's that report...John helped with the graphics" or "Where'd you go for lunch? Oh, John loves that place."
But if you were chummy before, don't ignore him now — that draws more attention than the occasional friendly moments does. No matter how covert you are, people are likely to catch on, but there's no need to broadcast it.