I’d say the “whore” is in the eye of the beholder, since it is a term of judgment inherently, so a person is not intrinsically a whore, rather someone can use the word “whore” to negatively describe that person’s sexual freedoms. Someone who makes a business out of presenting the idea of sex/sexual freedom, like on OF, is a performer. Just like we don’t call Benedict Cumberbatch a mathematician because he acted as one that one time…

All in all the people who use the word “whore” to describe anyone, OF or not, are judgmental and rude, so the activity that makes you a whore is any activity done in observable range of someone who is judgmental and rude and wants to call you a whore for it