B-C for work, D-DD for play. Anything bigger usually doesn't work, and obviously flat chested doesn't either. I can dig a smaller pair if the girl is well-proportioned for them, and typically the smaller girls are more down-to-earth and approachable because they haven't been hit on or harassed their entire life because they have big tits.
Of course then we're getting into the personalities behind the tits, and no man would ever want (read: admit to) that.
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