I really do not even want to write about the complex "thighs that go together" because I think it is so ridiculous and unfounded.
That the thighs touch each other when you stand up depends on how you are built. It absolutely does not define how slim you are, and even if it did, who cares? Narrow is not = good-looking.
As long as you do not eat so unhealthy that you really destroy your body, it does not matter. I know many who are bigger than me, but who eat much healthier - and they are just as nice and even hotter than I am!
You who take these "measurements" and feel bad that your thighs touch each other, skip the idiot blogs and read Egoinas.se instead.
Or stand wide-legged like the guy in the picture until they no longer touch each other, and realize that you are not fat either!