You knew that she did this before you got together - this is most likely her only income, no? I suspect desperation will be an ongoing thing for many people.
If you can i'd block the site totally and if she cant deal with that, it's kind of up to you if you want to deal with lying.
Some of those people im actually friends with now.
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I personally think porn is bad for lots of relationships.
And definitely talk to your sister about how this is affecting you as well.