So... a flirt asked me out... how am i supposed to tell if he really likes me?

There are two brothers in my workplace who act like this with a lot of girls. Both are known for being players and have cheated on their girlfriends with coworkers. Have fun flirting with them and maybe go out, but don't get into anything serious with them. You may catch them looking at you sometimes, but more than likely they are just thinking "man I'd like to hit that"