Twenge Jean M, Sherman Ryne A, Wells Brooke E
Department of Psychology, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182-4611, USA.
Department of Psychology, Florida Atlantic University, Boca Raton, FL, USA.
Arch Sex Behav. 2017 Nov;46(8):2389-2401. doi: 10.1007/s10508-017-0953-1. Epub 2017 Mar 6.
American adults had sex about nine fewer times per year in the early 2010s compared to the late 1990s in data from the nationally representative General Social Survey, N = 26,620, 1989-2014. This was partially due to the higher percentage of unpartnered individuals, who have sex less frequently on average. Sexual frequency declined among the partnered (married or living together) but stayed steady among the unpartnered, reducing the marital/partnered advantage for sexual frequency. Declines in sexual frequency were similar across gender, race, region, educational level, and work status and were largest among those in their 50s, those with school-age children, and those who did not watch pornography. In analyses separating the effects of age, time period, and cohort, the decline was primarily due to birth cohort (year of birth, also known as generation). With age and time period controlled, those born in the 1930s (Silent generation) had sex the most often, whereas those born in the 1990s (Millennials and iGen) had sex the least often. The decline was not linked to longer working hours or increased pornography use. Age had a strong effect on sexual frequency: Americans in their 20s had sex an average of about 80 times per year, compared to about 20 times per year for those in their 60s. The results suggest that Americans are having sex less frequently due to two primary factors: An increasing number of individuals without a steady or marital partner and a decline in sexual frequency among those with partners.
在具有全国代表性的综合社会调查（1989 - 2014年，N = 26,620）的数据中，与20世纪90年代后期相比，21世纪10年代初美国成年人每年的性行为次数减少了约9次。部分原因是没有伴侣的个体比例较高，他们平均性行为频率较低。有伴侣（已婚或同居）者的性行为频率下降，但没有伴侣者的频率保持稳定，这缩小了婚姻/有伴侣者在性行为频率上的优势。性行为频率的下降在性别、种族、地区、教育水平和工作状况方面相似，在50多岁的人群、有学龄儿童的人群以及不看色情内容的人群中下降幅度最大。在分析年龄、时期和队列的影响时，下降主要归因于出生队列（出生年份，也称为代际）。在控制了年龄和时期因素后，20世纪30年代出生的人（沉默一代）性行为最频繁，而90年代出生的人（千禧一代和iGen）性行为最不频繁。这种下降与工作时间延长或色情内容使用增加无关。年龄对性行为频率有很大影响：20多岁的美国人平均每年性行为约80次，而60多岁的人约为每年20次。结果表明，美国人性行为频率降低主要有两个因素：没有稳定或婚姻伴侣的个体数量增加，以及有伴侣者性行为频率下降。
