Do you think it is ethical to have romantic desires for people with good looks? I know the obvious (pop culture) answer is yes. One may even assert further that it is natural to do so.
However, my point then is that some desires, albeit natural, are unethical. (If I don't have money on me and I am hungry, I may feel the urge to steal some food.) And even though most people may feel that it is okay, the general public may be very often wrong.
My reasoning is:
(1) We should evaluate people only on their choices and not on conditions they haven't achieved by making choices.
(2) People don't choose to look good or bad.
Conclusion: Therefore, it is unethical to grant people ANY advantage based on their looks.
A friend of mine, against this argument, tells me that for instance, a mathematician has not chosen to be born with her talent, so we shouldn't also value her mathematical works. This seems like an inextricable tangle!
Where "looks" aren't relevant, then it seems foolish or wrong to take them into account. Deciding to hire people on account of their attractiveness to you, rather than on account of their ability to satisfy the demands of the job, seems counter-productive at best, unethical at worst. But you began rather with a question about whether "looks" are relevant in a romantic context . And now why shouldn't they be? Deciding with whom to hang out romantically isn't the same as deciding who's going to get the job of washing your car; a date is not a job interview. Attraction (of all different kinds) is the name of the game in romance. A romance without attraction (to how a person looks, laughs, talks, thinks, etc. -- all features over which a person has little control) is like Hamlet without the Prince.