Yes, you can reach your own G-spot.
*thinks for a moment*
Well, women can anyway.

And normal penetration, with a normally sized penis, passes right by it, tho not always up against it like is needed. It's only a few inches up inside there. 12+ inches on the other hand would be very painful for most women.
This is definitely a case of "don't believe the hype".

So I'm afraid that on planet Mor you will still have to restrict the reach of your slaves' hands in some way. How awful, huh?