I never understood it 100% because the first thing that I think of is to cushion yourself or to use the bathroom with. I understand how it can make a figure look nice or proportionate. But i never understood the attraction towards the butt itself. I just can't wrap my head around how we have parts that are used to feed children and to make sitting comfortable turn into a fetish and then normalized to the point where people go under the knife for it even though they dont necessarily find it attractive in the same way (talking about straight women) or some guys would be considerd gay if they didn't like either. Before ankles and legs were seen as sexual on women so they had to wear dresses all the time. I guess it's interesting how a simple fetish can hugely impact society.