Panties when you think about is are like prisons for the penis. Usually there is a hole for it to peek through but in panties there is no hole so it erects trying to force its way out of the fabric only to slide and glide across the silky fabric making it more angry and erect till finally it succumbs to the panties and spills its guts and whereabouts of the stolen jewels.
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If I had a harem they would only wear big purple nylon granny panties with lace waistbands and frilly leg bands. Okay maybe some floral prints, animals prints, and polka dots but it still would be purple.