At the purely fetish level, I favored relatively small breasts for at least half my life. But I can honestly say I never considered breast size when deciding whether to pursue a relationship with a woman. In any number of instances, I've known and liked some woman well, and if I had been asked, without her there to see, whether her breasts were smaller or larger than average, I wouldn't have had the least idea.
For at least 15 years after I noticed that girls were sexually attractive, I was so puritanical that I could have an extended relationship with a woman and never consider trying to cop a feel. Eventually that changed; but after it did, I was perfectly happy to caress a nice feminine nipple if that's about all there was there. A few fellow 'catters would know that the lady I ended up with is definitely buxom, though not extreme. Truth be told, I have come to enjoy that.