Taking the science route (because after all I did major in it), you want and like physically attractive women because it is built into your DNA like it is built into everyone else.  Why are women attracted to tall men with broad shoulders?  Is this any different than what animals do when they mate?  No.  Because after all we are animals, specifically mammals.  When we see boobs, legs, and physically attractive women we subconsciously think "dude I want to do her".  But biologically we are saying, "she can breastfeed my children, her hips can successfully deliver my many children, and she is physically fit".  That is why we are attracted to this stuff.  It works the other way too for women, they just put emphasis on different factors but they are still there. For example, qualities supporting a family whether financial or in terms of physically fit to produce fit children.  Is wealth and financial success not a turn on for women (at least the men who aren't cocky and self absorbed about it)?  And I think it is universally known that attractive people, men or women, catch the attention of the opposite sex.

Alas why do you feel guilty about only wanting to be with an physically attractive bf/gf?  Because unlike most animals, we have the ability to rationalize and socially interact in a way that doesn't require these physical characteristics.  Socially, in a society where we, at least most of us, try to judge and be judged on things fairly and equally.  In America for the most part, that is the founding idea.  But something like physical attraction is innately unfair for the reason that not everyone is physically attractive.  Although attraction is admittedly subjective, there is no one that finds everyone attractive (unless by some sick irony the least attractive person in the world might just by deduction).  But as unfair as either seem, this is why as you get to personally know someone they can become more attractive to you.  Because we have this ability to weigh and take in account an intellectual aspect to forming a connection with someone beyond the visuals of physical attraction.

Which should dominate your decision on choosing a gf and potential wife?  Thats up to you decide.  My questions to you, and the ones I think about or at least try to when I am meeting someone new is this.  Would I still be interested in her if she wasn't pretty?  What happens when she is older and she loses her looks or if I lose my looks?  Or if some tragedy happens and someone loses their physical attractiveness?  Will you stick around, will they?  Is physical beauty what keeps you in a relationship or more importantly keeps a relationship viable?

I welcome both sexes to look at these questions and maybe in some way it will help you decide on what you value in a relationship.