Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK.
Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
BMJ. 2019 May 7;365:l1525. doi: 10.1136/bmj.l1525.
To examine changes over time in the reported frequency of occurrence of sex and associations between sexual frequency and selected variables.
Repeat, cross sectional, population based National Surveys of Sexual Attitudes and Lifestyles (Natsal-1, Natsal-2, and Natsal-3).
British general population.
18 876 men and women aged 16-59 and resident in Britain were interviewed in Natsal-1, completed in 1991; 11 161 aged 16-44 years in Natsal-2, completed in 2001, and 15 162 aged 16-74 years in Natsal-3, completed in 2012. Comparisons of actual and preferred sexual frequency in men and women aged 16-44 (the age range common to all surveys) between the three surveys. Factors associated with sexual frequency of at least once a week were examined using Natsal-3 data.
Sexual activity in the past month; frequency of sex in the past month; preferred frequency of sex.
Median number of occasions of sex in the past month was four in Natsal-1 and Natsal-2 and three in Natsal-3 among women; and three in Natsal-1, Natsal-2, and Natsal-3 among men. The proportion reporting no sex in the past month fell between Natsal-1 and Natsal-2 (from 28.5% to 23.0% in women and from 30.9% to 26.0% in men) but increased significantly in Natsal-3 (to 29.3% in women and 29.2% in men). The proportion reporting sex 10 times or more in the past month increased between Natsal-1 and Natsal-2, from 18.4% to 20.6% in women and from 19.9% to 20.2% in men, but fell in Natsal-3, to 13.2% in woman and 14.4% in men. Participants aged 25 and over, and those married or cohabiting, experienced the steepest declines in sexual frequency (P values for interaction <0.05). Alongside the declines in sexual frequency, there was an increase in the proportion reporting that they would prefer sex more often. Age adjusted odds ratios showed that men and women in better physical and mental health had sex more frequently, as did those who were fully employed and those with higher earnings.
Frequency of sex has declined recently in Britain, more markedly among those in early middle age and those who are married or cohabiting. The findings and their implications need to be explained in the context of technological, demographic, and social change in Britain and warrant further investigation.
考察性发生频率随时间的变化以及性频率与选定变量之间的关系。
重复、横断面、基于人群的性态度和生活方式全国调查（Natsal-1、Natsal-2 和 Natsal-3）。
英国普通人群。
1991 年完成的 Natsal-1 调查中，年龄在 16-59 岁、居住在英国的 18876 名男性和女性接受了访谈；2001 年完成的 Natsal-2 调查中，年龄在 16-44 岁的 11161 人完成了调查；2012 年完成的 Natsal-3 调查中，年龄在 16-74 岁的 15162 人完成了调查。比较了三个调查中年龄在 16-44 岁（所有调查共有的年龄范围）的男性和女性实际和期望的性频率。使用 Natsal-3 数据研究了每周至少一次性生活的相关因素。
过去一个月的性行为；过去一个月的性频率；性频率偏好。
在 Natsal-1 和 Natsal-2 中，过去一个月女性的性行为中位数为 4 次，Natsal-3 中为 3 次；Natsal-1、Natsal-2 和 Natsal-3 中男性的性行为中位数为 3 次。过去一个月没有性行为的女性比例在 Natsal-1 和 Natsal-2 之间下降（从 28.5%降至 23.0%），但在 Natsal-3 中显著增加（女性为 29.3%，男性为 29.2%）。过去一个月中报告性行为 10 次或以上的女性比例在 Natsal-1 和 Natsal-2 之间增加，从 18.4%增至 20.6%，男性从 19.9%增至 20.2%，但在 Natsal-3 中下降，女性为 13.2%，男性为 14.4%。25 岁及以上、已婚或同居的参与者经历了性频率的最大下降（交互 P 值<0.05）。随着性频率的下降，报告更频繁进行性行为的比例有所增加。年龄调整后的优势比显示，身心健康状况较好的男性和女性性频率更高，完全就业和收入较高的男性和女性性频率也更高。
最近英国的性频率有所下降，在处于中年早期和已婚或同居的人群中下降更为明显。这些发现及其影响需要在英国技术、人口和社会变化的背景下进行解释，并需要进一步调查。
