To give an answer to this we just need to try to reproduce what's user experience visiting a Tgp.
Tgp's users are people who look for free adult content, as much as they can.
If they find a good Tgp with a good quantity of content they won't like to leave the index page, since it is the starting point to get more galleries.
That's why I think it is essencial, in this case, to open each gallery in a new window.
My 2 cents.
Cheers!
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