Sexual selection is a theory thrown around but afaik the work hasn’t been done to show this is the sole cause. Enlarged breasts may have some reason to exist beyond sexual identification - there’s not a lot of mostly bald mammals that walk on two legs so theres not a lot of good opportunities to spot convergence in features.
Sexual selection is a theory thrown around but afaik the work hasn’t been done to show this is the sole cause. Enlarged breasts may have some reason to exist beyond sexual identification - there’s not a lot of mostly bald mammals that walk on two legs so theres not a lot of good opportunities to spot convergence in features.