This is a bit off-topic, but IMO you should get your girlfriend to investigate other methods of birth control... There's fifty million of them out there and you two shouldn't settle for something that makes her not want to have sex when the whole point of birth control is that you can have sex a lot.
Sage (my wife) did the nuvaring for a while and it killed her sex drive too. She got off of that and we are really really glad of it.
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