Institute of Psychiatry, Psychology and Neuroscience, King's College London and South London and Maudsley NHS Foundation Trust, London, UK.
GKT School of Medical Education, King's College London, London, UK.
BJU Int. 2021 Sep;128(3):374-385. doi: 10.1111/bju.15416. Epub 2021 May 7.
To investigate a novel methodology and explore whether artificially reducing the depth of penetration during intercourse matters to women.
A study with a single-case experimental design ('n of 1'), in which a heterosexual couple act as their own control and the study is then replicated in subsequent couples, was conducted. Thirty-five couples were assessed for eligibility to participate. Twenty-nine couples without any sexual problems were randomized and 12 submitted sufficient data to analyse. As a proxy for reducing penis length, we artificially reduced the depth of penetration by using different sizes of silicone rings around the base of the man's erect penis. The main outcome measures were provided by the female partner on a scale of 0-100 and comprised: degree of (i) overall sexual pleasure; (ii) sexual pleasure from intercourse alone; and (iii) emotional connection to the male partner. The female partner was also asked before the experiment began to rate the degree of positive or negative change that would be personally meaningful for her.
On average, reducing the depth of penetration led to a statistically significant 18% reduction of overall sexual pleasure with an average 15% reduction in length of the penis. The longer the erect penis, the less likely the rings were to have an impact on sexual pleasure. There was a range of individual responses, however, with a minority of women reporting that reducing the depth of penetration was more pleasurable on some occasions.
Size may matter in women in a healthy stable relationship when there is penile shortening. Because of the small number of couples and the inclusion of men with an apparently long penis, our results are preliminary, and we welcome replication in a larger sample with a more diverse range of penile lengths. Our results should not be misinterpreted as meaning that increasing penile length will increase sexual pleasure in women.
探究一种新方法，探讨在性交过程中人为减少阴茎插入深度是否对女性有影响。
采用单病例实验设计（“n 为 1”），即一对异性恋夫妇作为自身对照，然后在随后的夫妇中重复该研究。评估了 35 对夫妇是否有资格参与研究。随机选择 29 对无任何性问题的夫妇进行分组，其中 12 对夫妇提供了足够的数据进行分析。我们使用不同尺寸的硅酮环环绕男性勃起阴茎的根部，人为地减少阴茎长度，以此作为降低阴茎深度的替代方法。主要观察指标由女性伴侣以 0-100 分的量表提供，包括：（i）整体性快感程度；（ii）仅性交带来的性快感程度；以及（iii）与男性伴侣的情感联系。在实验开始前，女性伴侣还被要求评估对她个人有意义的积极或消极变化的程度。
平均而言，减少阴茎插入深度会导致整体性快感显著降低 18%，阴茎长度平均减少 15%。阴茎勃起越长，环对性快感的影响就越小。然而，也有一些女性报告说，在某些情况下，减少阴茎插入深度会更加愉悦，存在个体差异。
在健康稳定的性关系中，当存在阴茎缩短时，大小可能对女性很重要。由于夫妇数量较少，且纳入了阴茎明显较长的男性，因此我们的结果是初步的，我们欢迎在更大的样本中进行更广泛的阴茎长度范围内的复制研究。我们的结果不应被误解为意味着增加阴茎长度会增加女性的性快感。
