I flirt with both men, and women.
I flirt because it is fun. I especially flirt when in a safe environment, i.e. when I am with my boyfriend so as not to have the one I'm flirting with confuse my flirtation as genuine interest.
But, when I flirt, there is some sort of interest there, it's a style of communication, of banter, of getting to know someone with an added layer of, well, fun.
I love hanging around people who have positive energy, and when I deem someone to be "good people", I tend to flirt with them all the time.
I will shower them with affirmations and compliments.
Do I do this so they will do it back?
Perhaps, on a subconscious level, maybe.
But I generally want my affirmation from a select few.