The third part is about the evolution of sexual intercourse.
第三部分是性交行为之演化。
参考来源 - 性权利视野下的强奸罪若干问题研究（研究生论文）·2,447,543篇论文数据，部分数据来源于NoteExpress
同义词： intercourse sex act copulation coitus coition sexual congress congress sexual relation relation carnal knowledge
以上来源于: WordNet
N-UNCOUNT Sexual intercourse is the physical act of sex between two people. 性交 [正式]
I have never had sexual intercourse with her and that is the truth.
我从未与她发生过性关系，而这是事实。
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