I'm fairly sure they mean Chrissy/Christine.
They have a point too. Chrissy and Gemma are kinda neck and neck for me, at least once Lucas is out of the picture. Gemma is hot, fun, and wild, but you always feel a lot more like you are, at best, just fuckbuddies. Chrissy is that bit more mature, grounded, and you know she is willing and able to commit if she decides to. Both are incredibly hot-bodied girls if you prefer them on the slim/slender side and aren't just spending a whole lifetime fixated on chest-buttocks.
That said, there are a number of really hot females outside of the housemates, and even several that are not as 'caricature-looking' (for wont of a better term for the stylized faces and expressions).