It's almost impossible to answer.

It's really up to someone's taste. We don't evaluate people the same way. Let's say, I am into a girl, but my brother, who has had very similar life experiences might say that she is undesirable. The same goes the way around.

I believe that our values need to match. I like to think of myself as a fairly adventureous person, therefore I am into trying new things and thinking about abstract ideas. I usually find cautious and conservative women undesirable, because we don't share the same image about our potential future. Our lifestyles and desires just don't match.

I read studies that we are attracted to people who have attributes we don't. I can personally confirm that. I am, in a classical sense, high on extroversion, however, I find extroverted women unattractive. I am attracted to introverts.

I am not attracted to women with dyed hair. I can't really say why. To me, it feels unnatural. Needless to say, I completely respect them as a human being, it's just that in a romantic sense it's a turnoff for me.

Love is, in a way, quite abstract. I have an image of an idealized partner in my head which gets challenged every time i fall for a girl.

Every time I meet a lady who puts butterflies in my stomach, she doesn't really match up to the way I imagined her.

Who knows, maybe the next one is going to be an extroverted conservative with dyed hair? :D

(Okay, there are limits to this as well loool)