I dont have an outright preference (it has never been a desire blocker whatever the size of their breasts) but the majority of my relationships and hook ups have been with small breasted women. I also love watching porn where a small breasted woman is dominated by a large breasted woman. All things considered I seem to have a preference to the smaller tits. I actually talked one female friend out of having breast enhancement. She wanted to do it because she felt she was less attractive to most men and embarrassed around other women. They were indeed small - like 2 half limes but she was a very pretty woman and I told her there are lots of guys who are not size kings when it came down to it ( including myself) I told her that I actually preffered it. She still was determined to go through with it so I said it is a lot worse for any guy who has a tiny penis than a woman with tiny tits. ( absolutely true because I have a very tiny penis and have had direct experience how size can matter in that case even if it is more amongst the male than female in importance. ) I have no exact numbers but despite the size doesnt matter mantra I know for a fact I have sometimes been filed into a 'just friends' category if a girl I fancied knew directly or through the gossip mill that I had a tiny cock. Tit size (or lack of it) is generally fairly obvious so at least there are few suprises when some one sees you in swimwear or naked for the first time. I however have seen the look of unabashed shock/surprise when a girl has seen how tiny my penis is even when most tried to mask it. It doesnt help that my overall physique and generally alphaesque demeanour ( plus size 14 shoes) tend to make people assume I have a dick to match.
Yes there are guys who are only attracted to larger breasted women and there are women who are completely unattracted to particularily tiny dicked men. (How many women espouse the idea of seeking sex with a small penis guy or boast about the size of their partners todger if it is tiny? Iwas with one woman for a while who used to lie about my size when gossiping with other women. I found out about this when I was in a one night stand with one of her friends ( after we had broken up) She was very obviously shocked ( and dismayed ) when she saw I was well below endowed. She told me how my ex always boasted about how big I was.
Anyway I digress a bit from the tit size thing but to make a point about the size matters thing in general.
By the way she never had the enhancement thing done, we did have a one night stand a few montgs after our little chat but it wasnt good - she was ab fab but I suffered close to premature ejaculation when I came in about 3 strokes. ( I suspect she wasnt exactly over the moon about my endowment anyway) I have known plenty of women who didnt think penis size mattered who just never had sex with a guy who had a particularily tiny penis.