I like women slim or curvy, both have their advantages haha.
I'll be honest, I don't find overweight women attractive, and i'm not ashamed to admit it either.
It's the same the other way around, I don't see why a woman would be likely to find an overweight man attractive.
Thing is, an overweight man is more likely to go out with an overweight woman, and vice versa. It sounds horrible but the age old term about one being in anothers "league" holds true in life. I would never actually say "i'm in a different league to you" - that would be sad, but society dictates we will go for people similar to us.
You should never tease anybody about their weight in a malicious way, I think that's cruel and I wouldn't do it.
Personality is a big thing, very important, but the initial attraction has to be there. My girlfriend thinks i'm great, but she thinks the fact i'm good looking is just a big bonus
Or so she tells me
Oh and my current girlfriend is petite and slim but still with the right amount in the chestal area (is chestal a word?), my last girlfriend (was quite long term) had a more curvy figure. Curvy is completely different to overweight though. Sometimes I think guys understand what is meant by "curvy" more so than a lot of women do.