a marriage in which the partners are free to have sexual relationships with other people.

We have an open marriage, but I never tell my husband about my other lovers.

• line your own pockets
• line your pockets
• lingua franca
• lions' den
• lion's share
• lips are sealed
• liquid lunch
• liquid refreshment
• list as long as arm
• list as long as your arm
• listen to reason
• listen with half an ear
• litmus test
• little bird told me.
• little bird told me so.
• little by little
• little horror
• little love lost between
• little love lost between someone
• little tin god
• live a charmed life
• live a lie
• live and breathe
• live and breathe something
• live and let live