These findings contradict the well-accepted idea of high prolactin levels being linked to men’s sexual issues. The results of this study suggest that the hormone could have a positive impact in initiating or stabilizing male sexual behavior. The study does not prove a cause-and-effect relationship between prolactin and sexual functioning. The researchers speculate that low prolactin reflects a change in the levels of signaling chemicals in the brain that are responsible for regulating sexual behavior. Also, poorer physical and mental health could be an underlying reason for low prolactin and a lower sex drive, said the researchers.