I completely disagree that the male g-spot is the penis. The G-spot it characterised by being inside the body and inaccessable without penetration. So let's say the penis is the clit...the vagina contains the G-spot so the mirror (close enough) would be the prostate, inside the anus.
And if you look up male G-spot on Google, you can tell that the prostate is most often refered to as 'the male G-spot'
No offense IAMSAM, but I suggest that you put more lines preceeding your words such as "In my opinion" or "I think that"
That's what I do and I can get away with things a lot easier that way, whether or not I am right