These are common in swim briefs destined for the asian market. Supposedly the mesh drains any water that accumulates inside the brief while swimming. The Aqux-branded briefs I imported all have this feature. Also, the briefs with the mesh often fit really low in back, leaving the top part of the butt-crack showing. The mesh seam can be made to cinch up between the glutes, dividing them, but also leaving a bit less butt crack showing. The seam fits between the glutes almost like a thong. The whole idea seems to be part of current asian style, very low riding in back showing a little butt crack with the mesh seam riding tight between the glutes.
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