They have marital relations.

他们有婚姻关系.

《简明英汉词典》

Sure enough, we fall asleep without any marital relations taking place.

果不其然, 我们没发生任何夫妻关系就睡觉了.

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He is a man of enterprise, He needs marital relations now.

他热爱生活、事业成功, 需要婚姻的男人.

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The love and the marital relations so are important?

恋爱与婚姻的关系就那么重要?

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For the rich and the powerful, keeping marital relations has become fashionable, particularly in officialdom.

由于财富和权力, 拥有婚外情在官场中逐渐变得时髦和显著起来.

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