Absolutes like that can always be proved wrong with one or two exceptions. You never met my parents. They'd been married for 40 years, in love with one another, and believe me, they were not 'stuck together'. It wasn't a passionate firecracker of a love that fizzles out once the fuse is burned and the sex is through, but a lasting relationship.
You believe in love between parents, children, family members, but remember, family members can also be a husband and wife.