Biology: Love Potions

Sex may be a natural act, but for the millions who suffer from sexual dysfunction, it can be vexingly unattainable. Below, a guide to some of the medical treatments available for what ails our libidos:



--Viagra, Levitra and Cialis: All these drugs work the same way, by relaxing smooth-muscle cells and widening blood vessels, primarily in the penis. Cialis stands out as particularly long-acting--up to 36 hours, compared with four or five hours for the others

--Testosterone: For men who don't produce enough, patches (Androderm, Testoderm) and gels (Androgel) deliver extra hormone through the skin


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