《Sex in America, the Definitive Study》（美国的性：权威研究）可能更有参考价值。[1] 这项研究完成于 20 世纪 90 年代。他们运用规范的随机抽样技术，在全美随机抽取了大约 3000 人。每个人都接受了问卷调查……
"Sex in America, the Definitive Study" is perhaps more useful.[1] This was done in the 1990s. They selected about 3000 people in the US at random, using proper random selection techniques. Each person was both surveyed…
…about income equality and tax structure). Effective fertility rate in particular is also radically different. As the author of the OP article points out, Japanese youth are delaying relationships and sex. In America, however, as in most other industrialized countries, the declining birthrate is mostly attributable to birth control, not abstinence.
《Sex in America, the Definitive Study》（美国的性：权威研究）可能更有参考价值。[1] 这项研究完成于 20 世纪 90 年代。他们运用规范的随机抽样技术，在全美随机抽取了大约 3000 人。每个人都接受了问卷调查……
"Sex in America, the Definitive Study" is perhaps more useful.[1] This was done in the 1990s. They selected about 3000 people in the US at random, using proper random selection techniques. Each person was both surveyed…
……关于收入平等和税收结构）。尤其是总和生育率（effective fertility rate）也截然不同。正如楼主（OP）那篇文章的作者所指出的，日本年轻人正在推迟恋爱和性生活。然而在美国，和大多数其他工业化国家一样，出生率下降主要归因于避孕措施，而不是禁欲。
…about income equality and tax structure). Effective fertility rate in particular is also radically different. As the author of the OP article points out, Japanese youth are delaying relationships and sex. In America, however, as in most other industrialized countries, the declining birthrate is mostly attributable to birth control, not abstinence.