Musk

Musk: that lovely not-too-girly scent in many perfumes. However, it actually originates from a gland between the stomach and the testicles in the male Musk Deer that is used as an aphrodisiac to attract a female Musk Deer. Consequently, due to over hunting for that oh-so-luxuriously-smelling-wonder-gland, the Musk Deer has faced near extinction. So, now perfumeries get their musk elsewhere; other plants and animals with similar smells and artificial ones as well.