Don't bother, if it gets out you'll be labeled a chubby chaser. Hooked up with a fattie once in college, my friends still make fun of me and call me a chubby chaser.
As a man your genetically predisposed to like girls with good hips for child bearing, fat to store nutrients and as an indication of being well fed and thus helathy, and of course big boobs and in some cases a$$. Every now and then this catches up with me and I find myself attracted to a girl with curves. But then i get drunk and hit on a fat girl.
A chubby girls curves become much less appealing when you get in bed with her and see her gut and enormous thighs. Yuck
