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On treatment for male erectile dysfunction (ED), a review article by Tam et al. (2001) concluded: Although well-tolerated and safe, even when greatly exceeding the likely therapeutic range, it is obvious that the efficacy of [yohimbine] as monotherapy in the general ED population is likely to be modest.
Venous leak, also called venogenic erectile dysfunction and penile venous insufficiency, is one category of vascular-induced (vasculogenic) impotence – a cause of erectile dysfunction in males. [2] It affects all ages, being particularly awkward in young men. [ 3 ]
Roman and Chinese cultures documented their belief in aphrodisiac qualities in animal genitalia, while Egyptians wrote tips for treating erectile dysfunction. [5] In Post-classical West Africa, a volume titled Advising Men on Sexual Engagement with Their Women from the Timbuktu Manuscripts acted as a guide on aphrodisiacs and infertility remedies.
During arousal it becomes engorged with blood and the erectile tissues expand and harden, causing first a partial erection (1:20) in which the penis is larger and slightly firmer but still flexible, and then a full erection (2:30) in which the penis reaches its largest size and becomes rigid and inflexible.
Protodioscin is a steroidal saponin compound found in a number of plant species, most notably in the Tribulus, Trigonella Dioscorea and Trillium families. [1] [2] [3] It is best known as the putative active component of the herbal aphrodisiac plant Tribulus terrestris.
This means that in the event of a rival male's sperm occupying the reproductive tract of a female, the human penis is able to displace the rival sperm, replacing it with his own. [42] Semen displacement has two main benefits for a male. Firstly, by displacing a rival male's sperm, the risk of the rival sperm fertilising the egg is reduced. [43]