Randy Orton has a physique that one can get naturally. Most wrestlers just use Steroids for their physiques because they don't have a lot of time to dedicate to dieting and training while on the road. Sitting at home and just working out and eating right, it would be possible to get his physique.
Not train back because Orton has a small back? This is genetics. He obviously trains his back.
Stop worrying about what girls care or do not care about. Some girls like big backs, some don't. Some like big arms, some don't. Some like 6 packs, some do not! Some girls like blonde hair, some like black hair. Some like brown eyes, some like blue eyes.