Yohimbine, from personal experience, enhances what you've got.. Viagra, from the very little I know about it, makes you have an erection (though I may be wrong, I haven't done any reading on it).
Apparently with Viagra you can maintain an erection long after sex, but with my experiences with yohimbine, you don't - it just makes you firmer/harder, last a tad longer, and have more enjoyable orgasms.
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