Damiana (Tunera diffusa) improves copulatory performance in sexually sluggish/impotent rats. - GreenMedInfo Summary
Stimulating property of Turnera diffusa and Pfaffia paniculata extracts on the sexual-behavior of male rats.
Psychopharmacology (Berl). 1999 Mar;143(1):15-9. PMID: 10227074
Full Citation: "Sexually potent and sexually sluggish/impotent male rats were treated orally with different amounts of Turnera diffusa and Pfaffia paniculata fluid extracts (0.25, 0.50, 1.0 ml/kg). While having no effect on the copulatory behavior of sexually potent rats, both plant extracts--singly or in combination--improved the copulatory performance of sexually sluggish/impotent rats. The highest dose of either extract (1 ml/kg) (as well as the combination of 0.5 ml/kg of each extract) increased the percentage of rats achieving ejaculation and significantly reduced mount, intromission and ejaculation latencies, post-ejaculatory interval and intercopulatory interval. Neither extract affected locomotor activity. These results seem to support the folk reputation of Turnera diffusa and Pfaffia paniculata as sexual stimulants."