With that said, maybe not so much "slimmer/bigger" but it starts to feel kind of weird if the girl is heavier than me -- from muscle or fat or both. It does feel more right to me if she's at least a bit lighter.
She only has to be lighter than 165lbs though (I'm pretty heavy even in my best shape).
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I like them anywhere from slim/petite to chubby/thick
I prefer chubby girls but the top girl doesn't somit for me.