1 . This, in turn, has increased their enjoyment of coitus .

繼而, 這又增添了他們性交合的樂趣.

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2 . They must, therefore, be inserted 10 to 15 minutes before each coitus .

所以, 每次性交前10-15分鐘就必須放入陰道內.

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3 . Their meeting is usually about as a result of coitus .

精卵相遇通常是性交的結果.

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4 . The vagina receives the penis during coitus .

陰道在性交過程中容納陰莖.

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5 . The intimate contact of the female sex organs during coitus can give both partners great pleasure.

在性交合過程中,男女性器官的密切接觸能夠給雙方帶來愉悅.

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