未婚而同居的男女sexual partner

• 卫生防疫部门对患者交待的性伙伴，进行艾滋病抗性监测。

  The health and anti-epidemic department is monitoring AIDS resistance in people that AIDS sufferers have revealed to be their sexual partners.

• 有人堂而皇之地在网上征集所谓的“性伙伴”。

  Some people openly recruit so-called "sexual partners" on the internet.