on the other hand it is curious how some girls don't get it! why? I suspect down to muscle tone
The causes are the same as for girls who have not had babies: diet and exercise. Genetics have something to do with it too, but nobody absolutely *has* to have a lot of belly flab.
my body is not perfect and let's just be comfortable naked together!
A lot of forum members seem to have this attitude, and if it works for you that's fine of course. For me, though, it's like saying: "I don't care if a restaurant meal is poorly presented; after all, I'm a pretty shit cook myself." In fact, it's worse than that because looks in a SP to me are more important than the presentation of a meal I pay for: I can still appreciate a dish that looks so-so if it tastes great, but if I don't find a SP genuinely hot then I'm almost certainly going to consider the punt a waste of time and money, even if the services are offered with skill and enthusiasm.
In short, I'm with alibirmingham (and of course some others) on this one: a SP's body is one her tools, so she should look after it as best she can. I very much try to avoid overweight girls (not just talking about bellies here). I'm by no means always successful, which has led me to punt less frequently than I used to.