He was very open in his attitudes about sex.

他对性的态度很开放。

《柯林斯英汉双解大词典》

Our club is open to everyone regardless of age, sex or educational background.

我们的俱乐部对所有人开放，不论年龄、性别或教育背景。

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Diggs said he has seen this lead to risky behavior, and he urges parents to be involved early in an open dialogue about safe sex.

CNN: Why youths aren't getting tested for HIV

Today, turtles often begin the sex act in open waters, sinking during copulation.

MSN: Fossilized turtles' sex act frozen in time - Technology & science - Science - LiveScience | NBC News

But both Kerry and Edwards, who say they are opposed to same-sex marriage but open to civil unions, were clearly trying to carefully step through the political minefield the issue presents.

CNN: Dems spar -- gently -- over electability, gay marriage, Iraq