The thing about Harry is that almost all males really do think like that...sort of. Where Harry is a little different is that he's more conscious of it. A guy seeing a woman he finds attractive is noticing all the same stuff Harry is, as a rule, but one you're past early teens or so it's usually so much a part of the daily background of thought that it's just...background, unless he finds her exceptionally appealing, or he's got semi-immediate plans involving her, or she's coming on to him or he thinks she is. Otherwise, those thoughts are going in parallel with other thoughts as well. Harry, though, tends to dwell on it more specifically, more consciously.
As Kurtin St. George observed, that particular trait is common to the classic/stereotypical noir detective archetype, too.
The comparison to Thomas is interesting, because it's actually natural for Thomas to be different. For one thing, he has to guard his thoughts more carefully to keep his Appetite under control, and for another, it's crude but true to say that Thomas can have almost any woman he wants, if he decides he wants her. The women who will say 'no' to him and stick to it are the exception, and he knows that, too.
So he's less motivated by 'what he can't have'. His frustrations are basically different than Harry's.
