Kumquats are sexy

From a NYT article:
"Kumquats, which are not citrus fruits but belong to another genus, originated in China and have been cultivated across Asia for centuries. They inspired some unorthodox grafting techniques: in "The Oxford Companion to Food," Alan Davidson cites this bit of instruction from the "Book of Nabatean Agriculture," a 10th-century Iraqi text: "The branch which is to be grafted must be in the hand of a beautiful damsel, whilst a male person has disgraceful and unnatural sexual intercourse with her; during intercourse the woman grafts the branch into the tree."