避孕藥消耗女性性慾

時間: 2011-06-04
 

服務藥物控制荷爾蒙分娩會讓女性的性慾大減,這已不是什麼祕密。一種理論認爲這種由雌激素和黃體胴人工合成的藥物會減緩體內睾丸激素的新陳代謝,近而降低女性的性慾。但發佈在美國期刊《婦產科》12期上的一項新的研究結果表明這種合成藥可能並不是讓女性性慾減退的肇事者。

來自俄亥俄州立大學醫學院的研究人員對50名性生活比較活躍的女性進行測試,這些接受測試的女性都曾經口服避孕藥或進行黃體胴注射。控制荷爾蒙分娩的藥物之所以被認爲讓性慾減退,部分原因在於服務這種藥物後體內性荷爾蒙的量會增加,而這與肝臟內血紅蛋白密切相關,而血紅蛋白又和體內的睾丸激素新陳代謝捆綁在一起,並阻止這種循環。相反,進行黃體胴注射,因爲缺少雌性激素,所以被認爲能避免這種情況的發生。

女性性慾功能指數是一項用於衡量性慾與性滿意度的指數,這項指數也用於檢查女性體內的睾丸激素和雌性激素的水平。

雖然兩種接受測試的人中進行黃體胴注射的女性體內的睾丸激素水平明顯高出,但在性慾或性滿意度上卻沒有明顯的區別。研究中女性性功能指數測試結果都處於高水平,但研究人員並沒有對那些沒有服用荷爾蒙控制藥物的女性在這方面的得分進行比較。

總體上,與只進行黃體胴注射的女性相比,服務控制藥物的女性教育程度更高一些,很有可能還未懷過孕,要過小孩,白人居多。不過兩個羣體都有穩定的性伴侶,年齡相仿,避孕的時間相當(平均在4至5年),都有着相同的宗教歸屬。研究人員對測試者的不同點給予更多關注,比如有沒有小孩,這可能影響到她們的性慾。

但是性滿意度的降低與口服避孕藥之間到底有什麼樣的關聯,新的研究也沒有搞清楚,但研究明確提示我們對於長期服務荷爾蒙控制藥物――或者說,已經厭倦了那搭檔?――的人,性慾減退可能另有其因。

It's no secret that women who take a hormonal birth control pill have less interest in sex. One theory as to why is that combination birth control pills ― which contain a synthetic form of estrogen and progestin ― lower the levels of circulating testosterone in the body, thus lowering women's libidos. But a new study published in the December issue of the American Journal of Obstetrics & Gynecology suggests that the makeup of the Pill may not be the culprit after all.

Researchers from Ohio State University College of Medicine tested 50 sexually active women who used either a combined oral contraceptive or a progestin-only injection. The combination birth control pill is thought to dampen libido in part by increasing the production of sex hormone binding globulin in the liver, a protein that binds to and inactivates circulating testosterone in the blood. In contrast, progestin-only injections, which lack estrogen, are thought to avoid this effect. (More on Time.com: )

The women filled out a Female Sexual Function Index (FSFI), a questionnaire designed to measure sexual desire and satisfaction. They also had their testosterone and estrogen levels checked.

Although free testosterone levels were significantly higher among the women using the injection, there was no significant difference between the two groups' scores on sexual desire or satisfaction. The women's scores on the FSFI indicated high levels of sexual function, but the study did not compare their scores to those of a control group of women who did not use hormonal birth control. (More on Time.com: )

Women who used the Pill were on average better educated and more likely to have never been pregnant or had children, compared with those using the progestin-only injection. They were also more likely to be white. Both groups had steady sexual partners, were of similar age, had used contraception for about the same amount of time (an average of 4 to 5 years) and had similar religious affiliations. The researchers controlled for differences like having children, which can affect sex drive. (More on Time.com: )

The new study doesn't clear up the mysterious link between diminished sexual satisfaction and oral contraceptives, but it does suggest the possibility that there may be something else about some long-time users of birth control ― oh, say, boredom with the same old partner? ― that could help explain it.

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