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[Halfdeck]

buymyporn.com/hornyblondes/
buymyporn.com/hotsexyblondes/
buymyporn.com/blondesluts/

If you're optimizing foldernames using keywords, use dashes, period or + between words. Google doesn't parse words in URLS. For example,

buymyporn.com/horny-blondes/
buymyporn.com/hot-sexy-blondes/
buymyporn.com/blonde-sluts/

buymyporn.com/hotsexyblondes/ will only get a boost when someone runs a search for "hotsexyblondes." Same deal with underscores.

buymyporn.com/horny_blondes/ is only optimized for "horny_blondes"

I would keep urls all in lowercase.