Wow, I just wake up and the thread is 4 page already. That's a good sign that the forum is not dead yet.
Now let's understand this way. For example, you go to the market, you saw a small thin chicken and a big well developed chicken :d So which one would you buy? Of course you'd choose the big one

So in this case, because being big, fat, is what cause the chicken to be bought (=die) sooner, you can call that's a curse.
Analogically, a beautiful woman, with big boobs, nice ass, has lots of men after her. If you are her boyfriend, you'd think that because of her pretty body, you'd have more opponents. So in this case, beauty represent rivals, dangers for you coz she could be stolen anytime, there're lots of guy which is better than you, got more money than you who desire her. So that's a curse.
Another example, if you are a very rich ppl, got lots of money, very handsome, there're 2 women in front of you. One is charming, as beautiful as a star. Other if it's not ugly, she still don't have a nice boobs, ass and face like other. So they are free for you, but you got only 1 min to choose. Who would you choose to spend the night with, to have enough capability to stimulating or hormone? You don't know if they have husband or bf or not. So if beautiful woman has already a bf. Do you think it is wrong to think that the beauty is a danger that would break apart her family, knowing that we're currently live in a world with high demand of money and power?