“Self-report studies indicate that cannabis could increase sexual desire in some users.

We hypothesized that intoxication increases activation of brain areas responsive to visual erotica, which could be useful in the treatment of hypoactive sexual desire disorder, a condition marked by a lack of sexual desire.

The aim of this study is to assess the aphrodisiacal properties of cannabis.

Cannabis intoxication increases activation of the right nucleus accumbens to erotic stimuli. This effect is limited to users whose prolactin is not elevated in response to intoxication.   This effect may be useful in the treatment of low sexual desire.”

https://www.ncbi.nlm.nih.gov/pubmed/28401285