Based on traditional use by Mexican herbalists and upon recent rodent scientific studies, it appears that Montanoa Tomentosa is a true aphrodisiac - boosting libido, erectile function and actually stengthening ejaculation. See the research links below. Note: This plant has been described to possess anti-pregnancy activity in women when the aqueous extract of the leaves is administered orally during early stages of pregnancy. This product should NOT be used by women who are pregnant or who may become pregnant. It can cause uterine contractions and bring on menstruation.