Genesis 30:14-16

14Reuben went out during the wheat harvest and found some mandrakes in the field. When he brought them to his mother Leah, Rachel asked, “Please give me some of your son’s mandrakes.”

15But Leah replied to her, “Isn’t it enough that you have taken my husband? Now you also want to take my son’s mandrakes?” “Well then,” Rachel said, “he can sleep with you tonight in exchange for your son’s mandrakes.”

16When Jacob came in from the field that evening, Leah went out to meet him and said, “You must come with me, for I have hired you with my son’s mandrakes.” So Jacob slept with her that night.