Yage, also commonly called ayahuasca, is made from a South American vine, Banisteripsis capi. It’s used by natives of Brazil in male rites of passage and by shamans in religious ceremonies to enhance their perceptions. Predictably, it’s hallucinogenic: The stuff contains two of the most powerful natural MAO inhibitors, harmine and harmoline. Small doses produce euphoria and empathy and enhance sex remarkably (for the user). It also regularly induces vomiting, which shamans consider part of the benefit, but which I cannot comprehend improving one’s sex life. In larger amounts it is quite dangerous and is not recommended without doctor’s supervision in any dosage.
Though heightened senses does tend to make for better sex, I wouldn’t class this in any normal definition of aphrodisiac.