My 2 cents:
All of us, men and women, would prefer to marry somebody we find physically attractive, and that usually includes sexually attractive. It’s not uncommon for both men and women to be attracted to some physical characteristic of the other person, especially initially.
However, when you are looking to marry someone, you had better love them for more than just their body, because they could lose that body. The woman whose big breasts you love could get breast cancer and need a mastectomy. Or pregnancy or age could cause changes in her shape. You will need to love her just the same if she no longer has big, beautiful breasts.
Most of us end up falling in love with the person, and that’s how we continue to love the other person when their looks change due to age, health and a lot of other bodily conditions.
In addition, I’ve known a lot of women with big breasts (including myself) and most of them (including myself) would be very turned off by a guy who seemed to be seeing us primarily as a pair of breasts, rather than as a person, who might happen to have nice breasts.