I'm kinda a natural flirt even if the flirting is unintentional.
When I worked in retail I stayed flirting with customers to get those extra sales. Male or female I didn't care.
But the encounters between me and one of my managers (the one that hired me) were always tense. He would randomly call on me over the system, and when I would respond, he would magically forget what he wanted in the first place, and always says "you want me to want you." Too bad he was married with kids.