Yes I'm sexist, I don't deny it. That however has nothing to do with this debate. What you don't seem to get is that an adult, long-term relationship does rely quite largely on sex. I don't know how old you are, but one day it might happen to you, and I'm sure you wouldn't want to do it with someone who looks like she got mistaken for the pig that she is at the local slaughterhouse and got her face even more mashed up.
http://www.artlex.com/ArtLex/uv/imag..._guyshead.jpeg
If you met this person and found that they had the most fantastic personality and were a right laugh, would you seriously bang them? I doubt it. You might well be her friend, maybe even a close friend, but you wouldn't want to get involved. I just said all this to a girl friend of mine (not girlfriend, girl friend) and she agrees with me, because she has a brain. I repeat:
If you are not attracted to someone, you cannot have a sexual relationship with them.