And if she's really into that SIM crap you could always be one of those poor bastards who pay for the SIMs Online and cover her charge. But I don't even know if it exists anymore.
Porn. You should surf porn together. Two heads are better then one, or three... heh... You could come up with a free-porn archive to rival StileProject or SublimeDirectory... Imagine the cash you could pull in from those ad clicks...
We did once have an idea for a porn website called ... it was an interesting premise which I think you could probably deduce on your own...
She also recently had an idea for making a myspace "music" page featuring nothing but recorded sex noises. We've yet to come up with a band name; suggestions are welcome.