At the end of the week of celebration, Laban let Jacob marry Rachel, and he gave her his servant woman Bilhah. Jacob loved Rachel more than he did Leah, but he had to work another seven years for Laban.
but Leah said, “It's bad enough that you stole my husband! Now you want my son's love flowers too.” “All right,” Rachel answered. “Let me have the flowers, and you can sleep with Jacob tonight.”
And don't have sex with the daughter or granddaughter of any woman that you have earlier had sex with. You may be having sex with a relative, and that would make you unclean.
Didn't God create you to become like one person with your wife? And why did he do this? It was so you would have children, and then lead them to become God's people. Don't ever be unfaithful to your wife.