Tying the know means slipping a noose around love and choking it to death.

Love is moral even without legal marriage, but marriage is immoral without love

Darling, I would follow you through the blackest midnight—just not without my trousers!

I must court her now,' said the Prince. 'Leave us alone for a minute.' He rode the white expertly down the hill.
Buttercup had never seen such a giant beast. Or such a rider.
'I am your Prince and you will marry me,' Humperdinck said.
Buttercup whispered, 'I am your servant and I refuse.'
'I am your Prince and you cannot refuse.'
'I am your loyal servant and I just did.'
'Refusal means death.'
'Kill me then.'
'I am your Prince and I’m not that bad — how could you rather be dead than married to me?'
'Because,' Buttercup said, 'marriage involves love, and that is not a pastime at which I excel. I tried once, and it went badly, and I am sworn never to love another.'
'Love?' said Prince Humperdinck. 'Who mentioned love? Not me, I can tell you. Look: there must always be a male heir to the throne of Florin. That’s me. Once my father dies, there won’t be an heir, just a king. That’s me again. When that happens, I’ll marry and have children until there is a son. So you can either marry me and be the richest and most powerful woman in a thousand miles and give turkeys away at Christmas and provide me a son, or you can die in terrible pain in the very near future. Make up your own mind.'
'I’ll never love you.'
'I wouldn’t want it if I had it.'
'Then by all means let us marry.

One should always be in love. That's the reason one should never marry.

In much of the policy debates about fatherhood and marriage, it has been assumed that two-parent families are better for children than one-parent families, ... But a number of studies now suggest that the well-being of children in mother-stepfather families is no greater, on average, than in single-parent families.