https://phys.org/news/2013-12-scientists-unearth-secrets-perigord-truffles.html and It is commonly believed that truffles, like other fungi, are homothallic, meaning that they reproduce themselves," said Paolocci. "Because fungi that reproduce this way do not need a sexual partner it was believed that truffle cultivation relied only on the environment and nutrition, now we know that is wrong." https://phys.org/news/2010-10-scientists-reveal-sex-wars-truffle.html and https://www.nbcnews.com/id/wbna40090841 when you eat a truffle you are eating it's sexual organ. neat, huh? rocky mountain oysters anyone?