I hate the words whore and slut. I prefer sexually liberated. If it feels good and your significant other is good with it, do it. It's OK for guys to do, so why not you.
Each has their own rewards. I am attracted to large breasts but it's what you do with them and how much you enjoy sharing your body with me that is important. I spend most of the time with my mouth on your pussy and your mouth than on your tits. As long as you like what I do with and to your breasts is what's important.