If you're speaking about SceneXpress then that's not the case. There used to be a rule which forced users to download, but it has long since been removed, you are free to use the account at your own discretion. At least as far as I know...
I'm not sure if you're aware of that, but SceneXpress is a general content tracker, it's not "sex stuffs" specific. If you've got other alternatives then you don't need it either way though.
Not really sure how this fits here...
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