Before I met my wife, I liked all breasts except for the really huge ones. And, when we met, I loved my wife's young, firm, 36C's But after a few years of enjoying hers, I found that women with smaller were the ones I liked most. You know, swinging is about getting strange, right? LOL!
And, in fairness, I remember once when my wife declined to swap with a couple we had an opportunity for. That wife, btw, was drop dead gorgeous and the husband seemed to be nice looking too. Later my wife explained that he was just too much like me, so why bother.
Now I guess my most attracted to female is a woman who has a bush and small breasts with long nipples.