Well maybe something is wrong with societal norms then? Because honestly if the focus was just watch attractive women hula hoop I would think it's creepy too but I wouldn't just say it's alright because of societal norms.
But I think it's impossible to really judge this situation without the context. Did other people decide to participate or was it really just two girls hula hooping the whole time? It boils down to was the mentality from the males perspective "oh hey, cool, people are hula hooping!" or "oh hey, the two attractive girls are hula hooping and I want to gawk at them!" The first one is fine, the second one is not.
But I think it's impossible to really judge this situation without the context. Did other people decide to participate or was it really just two girls hula hooping the whole time? It boils down to was the mentality from the males perspective "oh hey, cool, people are hula hooping!" or "oh hey, the two attractive girls are hula hooping and I want to gawk at them!" The first one is fine, the second one is not.