Most young women have only regarded
their breasts in a sexual context, so the idea of breasts for feeding a baby requires a major shift in thinking, and often even more so for their boyfriends.
For others they do,
in all kinds of ways they may find unacceptable, whether because they find their engorged, inflamed and bleeding
breasts unsexy (at a stage of their lives when they're probably finding much about their bodies unsexy, and
breasts might just be a bridge too far), because it ruins sex or them if they're leaking and letting down all over the place, or because the sensation of suckling stimulates
sexual feelings that they don't want
in any
context that involves their baby.