How do you know if Cho'Gath or Kog are male. TBH they could honestly have been female. You dont know how the different genders look in their races. Riot just decided to say he instead of she. Why? Cuz it's honestly a lot less confusing.
Plus arent you forgetting Annie? She by no means is standard huge boobs long hair type.
Also, if they put giant boobs on Annie I think there would be a much bigger problem to have a discussion about...