Be realistic - unless you're really small or big it won't matter to her unless she's into the big league or has a stretched out vagina - maybe due to children, genetics or fisting.
I once had a very short female with a superbig ass and nice thick legs.
Since the AssWorship series took its toll on me I was all "romantic" to grab the goods.
Great vagina but totally oversized - I flat out told her to start dating at the local zoo... preferably the anaconda section.