Lol... I agree with the hands and feet, but if I don't concentrate too hard and not too less, I can make pretty good outlines of them and go on from there.

The hardest for me is to get a female's chest or 'boobs' to look proportional. Either they're lopsided, smaller than the other, or when at an angle, you're unsure of how to draw it. Being a girl as I am, I try to pose and find different references too.

Edit: But a male's body would be hard too. I'm really unsure how to draw one, even outlining it. Cause I draw my men really flat chested, yet I show a bit of muscle here and there. And maybe, because men do have a tendency to look like females, ESPECIALLY with huge eyes and so forth. =(