My wife’s boobs are one of the most open girls sexually that I know. She is open to a wide variety of sexual activity in various situations, men or women, threesomes, being dommed, and various other things. Although she doesn’t search them out or make them a part of her life naturally.
It’s only when someone else creates a situation for her that she can slide into that she might be willing to join in a given moment. Otherwise, these types of sexual experiences are not a part of her life nor would be something she seeks out.