Wow, what a loaded question (no pun intended). I believe due to the location it's difficult for a man to stimulate his own prostate glade. He needs another person to stimulate it. Prostate gland is located between the man's bladder and rectum.
How interesting when we speak of G Spots when referring to females it is all about sex. When referring to male G spots, its all about cancer. What a shame it is Christianity has enabled legal mutilation of the male genitalia and hundreds of years later our society has serious issues with sexuality, a natural function for a healthy human body to be celebrated in lieu of false guilt inflicted by generations of dysfunctional and uneducated people This is a barbaric act of zealots which should be outlawed.