In a series *"The Science of Sex" it was shown that early primates looked at the female buttocks to detect fertility. Since we have become upright that cleavage has shifted upward. They showed 2 cleavages and guess which one was what? You couldn't [livescience.com] In a previous posting about lying I mentioned a book that gleaned some interesting facts. One was a question that was asked "my husband wants me to..." In India four times as many women answered that their husbands wanted to suckle their breast milk!!
For me I prefer average but most importantly is the personality that goes with them!

softly bite mine when I'm cumming, please

I've had wonderful, memorable experiences with women with breasts of different sizes, so I'd have to say size really doesn't matter.
When it comes to breasts, the sexiest part is when she gives you that look, undoes that one shirt button that goes there, that kind of thing. The actual physical characteristics of the breast aren't important.

I have known two women with rather large chests. They both opted for breast reductions as the weight was difficult on their backs.

I will admit openly I am a sucker for breasts...from a to zzzz size apparently has nothing to do with sensitivity or sensualness....but, I do not envy the girls going thru puberty, with the 3 year old males and their behavior

Kudos to you for asking! It may not be shyness but rather that they may want anything other than breast attention. Some women disassociate from their breasts during or after breastfeeding. Another reason for not enjoying breast relates to the constant sexualizarion of breasts that leaves a feeling of, “I am more than my boobs! Stop looking at or playing with them already!” Perhaps once your partners understand how accepting you are, they will feel more free to explore what they enjoy.

Totally thought this was going to be a sexist post, thanks for proving me wrong!