A tip for those who plan on opening a brothel for arachnids...

From here

WASHINGTON (AP) -- What puts that sexy twinkle in a spider's eye? A mate aglow. Take away the ultraviolet portion of light, and what seemed like the arachnid version of Scarlett Johansson or Matthew McConaughey attracts no more lust than plain Jane or dumpy Dan.

While people can't see ultraviolet light, spiders can, and it turns out to be important to their mating, researchers report in this week's online edition of the journal Science.

Some scientists have too much time on their hands.