Most of the girls are Bs and Cs; Olivia, Sarah, Jannice and Diana are the only ones with a larger bust. Partially that's just personal preference, partially it represents the fact that they're all high-performance athletes of different kinds (Martial Arts, HEMA and dancing), which tend to not lead itself to a lot of body fat.
So only the girls you don't get intimate with. Girls come in all shapes and sizes. Watch an Olympic gymnast competition and show me a 20 year old with skinny legs and a tiny ass, they're non-existent. Being athletic doesn't exclude being curvy, it just reduces the chance. I'm not demanding a bunch of double j hentai chicks, I'm just saying a little more variety would be nice.