For research purposes, of course, the 5" Male P-Spot Prostate Massager in Black from Blue Line Men is backed by extensive medical research to provide pleasure by working in tandem with any prostate owner. By stimulating the prostate and the perineum, it leads to intense rhythmic orgasms. The massager is easy to use and fulfilling for both the novice and the more familiar. Continued use is recommended for a progressively rewarding experience, as is a water-based lubricant.