Taicea, Taicea. People flirt for many reasons. How to tell, well, that all depends on the person doing the flirting.

There can be verbal clues, such as how pretty or handsome someone looks to more physical ones such as a light touch on the small of one's back, to a gentle lift to the chin. Usually, they are accompanied by gentle, yet persuasive words.

Then, there are some people that flirt who are not subtle at all. This could mean cat calls to lewd comments about one's body. As you had put it once before, they are generally a lot more blunt.