Work crush? gay or No?

so there's one guy at work that looks like ADAM Lambert my fav singer of all time. he's got the gages the spikes black hair and the leather jacket. people think the guy at work is gay... how do you tell? how do you ask him out if he's not? he's a nice guy I know that but omg he's cute. I. can stay composed at work thankfully but I really want to get to know him better. what do I do?
Work crush? gay or No?
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