No idea on the male Gspot sorry, I am a very effeminate man who 100% likes women (as I say every time someone asks me if I am gay... I wish, my life would be simpler

). I
can tell you butt stuff with a girl is over-rated, outside of the power/dominance fetish you really are just fucking a bottle
I did have a funny argument with a friend once about g-spots, a guy friend was saying there is no such thing, and I said there is, its a little to the left and abit in there (maybe nearly a finger). My other friend started to argue and she said 'no its slightly on the right'. We argued for like a minute before I realized the guys left is the girls right

.
Re a dick - depends, everyone assumes the head is the most important, when if you think about it the point on the shaft that is in frequent contact with the tight part of a VJ during sex is arguably just as (if not more) important (like a coal minor never forget to work the shaft! but at the grip of a VJ). Also I have been with girls whos clit was too sensitive to touch (it was a turn off, and no they didn't have syphilis were just that way naturally), so I'd assume the same to be true of some men. With those women it was a case of 'playing to field' so to speak haha (basically I used all the cheat cards like a gentle touch on the back of the neck back up with eventual heavy breathing). Wasnt easy, but enough foreplay and again the rest sorted itself out.
Balls I think is a fetish thing (cant really comment not for me) but gooch is good if done right (like back of a girls neck if they have long hair its hyper sensitive so a good heavy breathing through to light/medium touch can go a long way). Tossing salad can be nice but that isn't for everyone & if not prepared properly... well don't dive into that one.
Edit: Gay friends have confirmed the prostate is 100% a g spot, but its also an almost (if I remember correctly etiquette is you are meant to reach around at the same time). Could be wrong, that particular conversation was a long time ago.