Yohimbine
"As an upcoming psychiatrist and a sufferer from Obsessive Compulsive Disorder, I studied many ways to counteract the sexual side-effects caused by SSRI. Although this medicine is not commonly prescribed in the US, it's available in my country, and with a three times a day administration, it did increase libido and anorgasmia.
Nevertheless, some side-effects are very discomforting, and include diaforesis, anxiety and hypersalivation."