sexual union

英 美
  • 性结合
  • sexual adj.性的;性欲的;有性生殖的;性别的
  • union n.结合;工会;联盟;和睦;连接轴;【数】并,并集adj.联邦政府的;工会的
Noun:
  1. the act of pairing a male and female for reproductive purposes;

    "the casual couplings of adolescents"
    "the mating of some species occurs only in the spring"