sex life

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You can see I am only starting to get my life together now, and that's out of the sex trade;
Maybe you want to learn how to study better, improve your sex life, interpret your dreams, and win friends and influence people.
也许你想学会如何更好地学习,想提升你的性生活质量,想为自己释梦,想多交点交朋友,想学会如何影响他人
耶鲁公开课 - 心理学导论课程节选
Milton is adamant throughout the epic in his insistent imagining Adam and Eve quite specifically as a married couple - and a married couple -- and this is important to Milton -- a married couple with an active sex life.
弥尔顿在他的叙事诗中坚定不移的认为,作为已婚的夫妇，亚当和夏娃,已婚的夫妇--这一点对弥尔顿来说很重要-,有频繁性生活的夫妇。
耶鲁公开课 - 弥尔顿课程节选

The sex life of morels is mysterious, but we know that they are necrophiles.
NPR: Morel Satisfaction: Stalking the Wild Mushroom
V. test and that he tell her about his sex life, past and present.
NEWYORKER: The Miner’s Daughter

If you refer to someone's sex life, you are referring to their sexual relationships and sexual activity.