Generally I notice whenever someone answers a question, whether it's male or female, if their attractive, at least from my standpoint they get more 'thumbs up'. Especially when I see people make good points or arguments they still get downvoted for whatever reason. Why is that?
most of the time when you see many people getting down voted on a particular question, it's probably a troll, that either hates the question asker and just down votes everyone.
I always vote up for people of whom answer I totally agree with and usually also leave a comment that I agree with them. I do down vote anonymous sometimes, because in many questions they give really stupid answers, though sometimes you do see an anonymous give a really really good answer, but still stay anon, I don't know why.
getting down voted doesn't really give you a penalty or nothing on your points, so I don't really mind em anymore, even getting up voted doesn't give you anything anymore, only the acknowledgement that some people agree with you.
Now vote up my answer dammit, or I'll send jelly fish to sting you.
I base mine on the answers as far as I'm aware, but I think subconsciously people end up agreeing with more attractive people. That goes for all fields, if you're attractive you succeed more because people subconsciously end up cutting you more slack without knowing :) I try not to though.
I rate based on their answers, not by how they look. But I've noticed myself some people on here who have really excellent answers get like 5 votes down, I mean, what the f*** is your problem? And I just think most users on here favor some against others, like if that person is your friend the person will just comment "I love you dude! <3333 or "righteous man!" ..that sh*t is just so stupid.