Alright, here's my scientific go at it:
Attraction in general comes from what is biologically perceived as better to raise kids. Therefore, the general attraction to the mammary glands comes from the notion that larger breasts=better-fed children. A larger bottom implies larger & stronger hips, meaning that the baby and mother are more likely to survive birth.
Yeah. That's pretty much it and women look for strong guys because they want someone who can impregnate them and not get them or perhaps her killed in a fight over lord knows what reason.
