Well, I think the pressing example in the United States right now has to do with people who are gay, lesbian, bisexual and transgendered.

恩，我觉得，就当前美国的情况来说,最能说明问题的例子就是,同性恋，双性恋，以及变性人。

普林斯顿公开课 - 人性课程节选

And most people are heterosexual There's a considerable amount that varies cross-culturally of people who are bisexual But the real puzzle is exclusive homosexuality ? So, why?

多数人都是异性恋的,而且不同文化背景下…,还有很多双性恋者,但真正的难题在于绝对同性恋,为什么呢？

耶鲁公开课 - 心理学导论课程节选