died in the wool

good morning, herr doktor,
ah, my boy! come see! I am about to astound the scientific world!
again?
indeed! I've completed my study regarding the effects of wearing wool trousers on the sex life of rats! you would not believe what I found!
I'm sure I wouldn't.
the ramifications for the sexual potency of human males cannot be overstated!
I wouldn't even try.
unfortunately, no human subjects would wear wool in the desert. the short-sighted cretins!
but rats didn't mind?
the tailoring was a bit of a challenge, but they looked quite nice, actually.
and the sex?
what? oh, it was obliterated. those females wouldn't go near them.
guess I'll stick to cotton.
good choice.