If you’re unfamiliar, a prostate massage is the stimulation of the male prostate gland for sexual purposes.  And as it turns out, this is a sexual trend that's secretly growing in popularity amongst guys -- ones at that.  So, exactly what feels so good about it?  And, how does a guy achieve this sort of mind-blowing pleasure?  Per Reddit, men reveal what they love about prostate massages, and offer tips on how to reach that big O via one.