Name calling in bed...

LOL okay so I know it is probably very simple and I should just ask him but... my boyfriend isn’t very kinky in the sense of name calling in bed but I want to be called stuff like “slut” and “whore” ect.. how did/do you guys ask your man to call you that without being awk lol I am pretty shy outside of bed so I don’t know how to go about it. Plz help