Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
J Sex Med. 2010 May;7(5):1842-52. doi: 10.1111/j.1743-6109.2009.01671.x. Epub 2009 Dec 30.
There is an ongoing debate around the existence of the G-spot--an allegedly highly sensitive area on the anterior wall of the human vagina. The existence of the G-spot seems to be widely accepted among women, despite the failure of numerous behavioral, anatomical, and biochemical studies to prove its existence. Heritability has been demonstrated in all other genuine anatomical traits studied so far.
To investigate whether the self-reported G-spot has an underlying genetic basis.
1804 unselected female twins aged 22-83 completed a questionnaire that included questions about female sexuality and asked about the presence or absence of a G-spot. The relative contribution of genetic and environmental factors to variation in the reported existence of a G-spot was assessed using a variance components model fitting approach.
Genetic variance component analysis of self-reported G-spot.
We found 56% of women reported having a G-spot. The prevalence decreased with age. Variance component analyses revealed that variation in G-spot reported frequency is almost entirely a result of individual experiences and random measurement error (>89%) with no detectable genetic influence. Correlations with associated general sexual behavior, relationship satisfaction, and attitudes toward sexuality suggest that the self-reported G-spot is to be a secondary pseudo-phenomenon.
To our knowledge, this is the largest study investigating the prevalence of the G-spot and the first one to explore an underlying genetic basis. A possible explanation for the lack of heritability may be that women differ in their ability to detect their own (true) G-spots. However, we postulate that the reason for the lack of genetic variation-in contrast to other anatomical and physiological traits studied-is that there is no physiological or physical basis for the G-spot.
关于 G 点——人类阴道前壁据称高度敏感的区域——是否存在，一直存在争议。尽管众多行为学、解剖学和生物化学研究都未能证明其存在，但 G 点的存在似乎在女性中得到广泛认可。迄今为止，所有其他已研究的真正解剖特征都已证明具有遗传性。
研究自述 G 点是否具有潜在的遗传基础。
1804 名年龄在 22-83 岁之间的未选择女性双胞胎完成了一份问卷，其中包括有关女性性行为的问题，并询问是否存在 G 点。使用方差分量模型拟合方法评估遗传和环境因素对自述 G 点存在差异的相对贡献。
自述 G 点的遗传方差分量分析。
我们发现 56%的女性报告有 G 点。患病率随年龄下降。方差分量分析表明，自述 G 点出现频率的变化几乎完全是个体经历和随机测量误差的结果（>89%），没有可检测到的遗传影响。与相关的一般性行为、关系满意度和对性的态度的相关性表明，自述 G 点是次要的伪现象。
据我们所知，这是研究 G 点流行率的最大规模研究，也是第一个探索潜在遗传基础的研究。遗传率低的一个可能解释可能是女性在检测自己（真正的）G 点的能力上存在差异。然而，我们推测，缺乏遗传变异的原因——与其他已研究的解剖学和生理学特征不同——是 G 点没有生理或物理基础。
