This way they could get warm and toasty while maxing out on Vitamin D.
Their females would also bear twins (to up their reproductive rate) and have 4 large breasts to deal with the standard baby load.
“and have 4 large breasts”
I seriously doubt that, but we can dream.
I am pretty sure that none of the higher primates have more than two breats, in fact only some lemurs and no monkeys or apes have more than two breasts.