Questions of human nature

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the human brain groups objects in our environment based on our expirience and interactions with them. if your straight or tends towards it, everyone who has ever hurt you romantically is going to be from the oopposite gender. man-hating & women-hating is just a natural result of human wiring. you are you can either be very lucky in relationships, pretend it isn't happening in your brain for social expectation's sake (political correctness), or be aware of it enough to question any resulting assumptions before you use them to make a judgement call.

as for prefering good looking women, their have being many experiments showing that everyone does it: an attractive woman in distress is more likely to get help from both man and other women then someone who isn't.
there are even studies that use it as an economical symptom - attractive waiters. when the economy is good employers are less deductive about who they hire and are more likely to hire and advance better looking people (both males and females), but when it goes bad and they look at who's critical and who isn't, skills come at first place - and while it can easily correspond with attractive people - a lot of those that got their job simply for being attractive will be the first one to loose it. the result is a lot of attractive people in entry level service jobs, where attractiveness brings customers.

its just natural - society is made out of people that are more attracted to people who attract them - there's no need for a leap of logic, we're just much much shallower in instinct then society told us we are awe to be.