Apparently Rhinoceros horns are ground up and used to enhance virility. Do they work at all?

I was watching 'wildlife docs' and poaching is still a big problem. If I heard right, they say Rhino horns fetch 45 thousand a pound! So that would explaing the poaching. But are people that buy concoctions made from Rhino horns just wasting their money? Are they in reality good for anything at all?
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