1. English is widely used in international intercourse.
    英语在当今国际交往中用得很广。

2. We don´t have much intercourse with him.
    我们和他没什么交往.

3. Within the first six months of life the human brain doubles in capacity; it doubles again by age four and then grows rapidly until we reach sexual maturity.
    人脑的容量在生命开始的最初六周增长了一倍，到四岁时又增长一倍，其后大脑的容量迅速发展直到性成熟为止。

4. Do you think sexual act outside marriage is wrong?
    你认为婚外性行为是不对的吗？

5. AIDS spreads in three basic ways: first, through sexual intercourse(性交); second, through contact with diseased blood; and third from an HIV mother to her baby.
    艾滋病的传播有三种基本方式：第一，通过性交；第二，通过接触艾滋病患者的血液；第三，经由携带艾滋病毒的母亲传给婴儿。

6. I am a person, a sexual being, a person who struggles, for whom there are important issues to explore, new things to learn, challenges to meet, beginnings to make, risks to take, endings to think about.
    我是一个人，一个有性别的生命，一个努力奋斗的人，她要探索重大问题，要学习新的东西，要迎接新的挑战，要有新的开端，要担当风险，要考虑结局。