Are there parts of your body that are less than perfect? Too big, too small? Too much of this, too much of that, not enough of this, not enough of that? Shall we get the magnifying glass out, and examine and discuss at length? What do you say? No? Good, let's do something fun instead!
Two lovers. She's wondering if he's noticing her self-perceived imperfections. He's not thinking about anything other than how lucky he is that she is there with him!
Please believe me, the last thing I'm thinking about is whether your behind is too big.