Women just like men (if not more so) are heavily influenced by the media that makes out guys are very lean and muscular without spending any time, effort and money to get that sort of physique.
It's a falacy and some woman are too immature to realise this. In fact pretty much anyone who hasn't spent at least a year training thinks it's a lot easier than it actually is to get big and muscular.
People tend to overestimate their own potential and under-appreciate other peoples achievments.
If you want a women that looks after her hot bod then chances are she'll want a guy who does the same.