Though clothing can go a long way towards concealing skin and shifting perception of what’s under the proverbial hood, most dudes will be well aware of who they are going to see naked. They are not expecting a woman they have been spending any sort of time with to categorically look like an LA volleyball circuit queen when she mounts them. The belly you bring to dinner or on the walk to his car is the same belly he more or less will be expecting (nay, hoping) will be gyrating above him two hours later. That said, here’s another fact. Some men LOVE belly rolls. Some men find washboard abs un-sexy, un-feminine, un-erotic, and would much prefer a chick with some round. With some bounce.
And that said here’s a final fact. Unless you are purely in a one night stand flesh meets flesh hook-up, sex is about more than inches, and colors and shapes. It’s about the totality of the person. Most sex worth having involves rolling with the person. Regardless of their rolls.