Jesus doesn’t approve of individuals being tangled up in one or more sexual relationship simultaneously. Jesus created guy and girl inside the image (Genesis 1:27) in which he designed for guy and girl become united in marriage (Genesis 2:24).
Exactly How God had meant wedding become
In reply to a relevant concern from the Pharisees, Jesus quotes Genesis 2:24, how Jesus had meant wedding become: the union of 1 guy and something girl, residing together faithfully (Matthew 19:1-9).