This raises some interesting questions.

In apes, does sexual attraction to breasts have an adaptive value?
Are human female breasts sexually attractive only because of social conditioning?
It seems to me that breasts in female humans could have a number of different possible adaptive values, and because of this it seems logical that the perception of them as sexually attractive is at least partially hardwired, and not entirely socially motivated.
One related question. In human societies where breasts are not taboo, are they considered desirable in some proportion of males in those societies?

It just reminded me of the bowl of goat's milk that old Winthrop used to put outside his door every evening for the dust demons. He said the dust demons could never resist goat's milk, and that they would always drink themselves into a stupor and then be too tired to enter his room..