Gluteal fold
From wipipedia.org
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The gluteal fold or gluteal sulcus is the crease where the top of the thigh meets the buttocks, marking the very top of the leg.
Catching a glimpse of this fold under a miniskirt is considered an erotic experience by some, as they feel that they are viewing a "forbidden area". Often hotpants are brief enough to revel them.
A very noticeable fold may be a sign that the buttocks are saggy, due to obesity or poor muscle tone. The fold is much less noticeable, and may disappear, when the person is bending forward or crouching.
