Make sure that you feel the prostate swell. It's the male version of the G-spot and reacts to stimulation in a similar way. If you stimulate it and have an orgasm at the same time, studies have found that it’ll increase the intensity of your orgasm, sometimes by a third. And some men are able to have multiple orgasms this way as well.Read: Your Guide to Choosing (and Using) a Prostate Massager