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  Indian J Med Microbiol
 

Figure 1: Diagram of regular PRM: the PRM was performed by placing the thumb (one hand) or thumbs (two hands) on the root of the penis (no more than 1/3 of the erect penis) and rubbing the penile root up and down (straight arrow) or circularly (curve arrow) with a certain degree of friction. PRM: penis-root masturbation.

Figure 1: Diagram of regular PRM: the PRM was performed by placing the thumb (one hand) or thumbs (two hands) on the root of the penis (no more than 1/3 of the erect penis) and rubbing the penile root up and down (straight arrow) or circularly (curve arrow) with a certain degree of friction. PRM: penis-root masturbation.