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男性性功能包括性欲、阴茎勃起和射精。勃起功能障碍包含了这部分人中的大多数,在过去术语中较为含糊,因为“阳萎”被用来泛指性功能障碍的各方面, 1992年NIH国立卫生研究院将ED(勃起功能障碍) 正式用来描述同阴茎勃起相关的问题,ED指不能得到或维持一定长久的勃起而获得满意的性交。几十年前Master和Johnson将ED定义为不超过25%的性交过程中,不能达到或维持足够时间的勃起来获得满意的性生活,这个定义似乎更现实和更可取,因为承认了这样一个事实,男人可偶尔有障碍,但仍属正常。
Male sexual functions include libido, penile erection and ejaculation. Erectile dysfunction, which includes most of this group of people, is vague in the past because “impotence ” is used to refer to all aspects of sexual dysfunction. In 1992, the NIH National Institutes of Health replaced ED Dysfunction) is formally used to describe problems associated with penile erection. ED refers to sexual intercourse that does not obtain or maintain a permanent erection for a long time. It would seem more realistic and desirable that Master and Johnson define ED as not more than 25% of sexual intercourse decades ago when it failed to reach or maintain ample time for an erection to reach a satisfactory sexual life, recognizing the fact that, Men occasionally have trouble, but still normal.