My first observation from my new status of celibacy; as a woman if you are deemed to be 'easy' this is not a reflection of your actions but rather the state of a man's mind. If he thinks that he could have you; you are easy. Regardless of whether he could actually have you or not.
It could be that you smiled at him, or complimented him, or showed interest in his opinions. If you told him that he was good looking that would definitely mean that you wanted to fuck him and God help you if you looked him in the eye for more than five seconds. You hussey.
It's not what you do, but what they think you might do that counts.