I mix it up across domains; some months google likes subdirectory index pages, eg.
domain.com/big-tits/index.html (or rather the URL that you would link to would be domain.com/big-tits/ - better to leave off the index.html part).
other months they tweak the algo and like
domains.com/big-tits.html
So if you've got a mix across both domains it might help even out your total traffic over time in some small way.
btw Matt Cutts is on record saying that G does better when words in urls are separated by a hyphen (eg. big-tits vs bigtits), but that was some time ago.
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