Well I'm sure there will always be men who think women's breasts are 'sexual'- but then there are many men who think women's legs 'sexual'. Indeed, one can argue legs are 'more sexual' since they lead right to the pubic region! And remember, it wasn't that long ago that women's legs could not be shown in public. So I think the real question is not rather breasts are sexual but rather they must be kept covered? If we learn from our experience with legs, the answer is no.