[NSFW] In your mind, what behaviors would make someone a slut?

Is it a numbers game? More than x sex partners and you’re a slut? Or is it defined by time and numbers? X sex partners in a year or month or whatever?

Is it an attitude, such that one person could have 100 partners and not be a slut, while someone with two partners would be? Is it a personality trait? If so, how would you describe that trait? What kind of attitudes and behaviors would a slutty person exhibit?

Can a man be a slut, or is this a term reserved for women? If a man can’t be a slut, what would the male equivalent be? Are there different standards for men than there are for women in deciding if you would call them a slut? What are those standards?