Genesis 30:14

30:14 At the time of the wheat harvest Reuben went out and found some mandrake plants in a field and brought them to his mother Leah. Rachel said to Leah, “Give me some of your son’s mandrakes.”

Genesis 30:16

30:16 When Jacob came in from the fields that evening, Leah went out to meet him and said, “You must sleep with me because I have paid for your services with my son’s mandrakes.” So he had marital relations with her that night.