sexual relations

例句：

1. 1. In a sexual relationship, both partners have equal rights and responsibilities.
   在一段性关系中，双方的权利和责任是平等的。
2. 2.The couple's sexual relationship was strained due to their different lifestyles.
   这对夫妇的性关系因为生活方式的不同而变得紧张。
3. 3. The researcher found that sexual relationships are influenced by various factors.
   研究者发现，性关系受到各种因素的影响。