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He told Daily Mail: "When this is in alignment, you'll be able to see the funny side of most situations and generally be more relaxed about what life may throw at you. Any arguments can be diffused and you'll appreciate each other much more."
James adds that humour also demonstrates a high degree of intelligence, so it's an attractive quality, especially for women looking for a mate.
"However, to make things work really well, you have to have what's known as 'affiliative' humour.
"This is the the type of humour that boosts happiness, well-being and brings people together. It's all about finding common ground with shared stories and anecdotes.
"When you can both laugh about things together then you'll naturally bond and be a stronger couple."