Prostate massage (also known as A-massage) refers to the stimulation of the prostate through the anus, usually with a finger or a toy designed for this purpose. It is offered in the tantra/wellness sector and can trigger very intense orgasms.
Standard procedure involves using a latex or nitrile glove and plenty of lubricant. Approach cautiously and slowly—stop immediately if pressure causes pain (rule out hemorrhoids, prostatitis, and BPH).