I see, that's a shame but do talk to a specialist. You'll be surprised what options are available medically. But if you want to go this route of sharing her with someone else, then make sure it's something you're both comfortable with. I'm sure you'll have plenty of volunteers, so take your time and see what works for you both. If she's watching gangbang porn, then she might love the idea of being the centre of attention, but it can be physically demanding and you need to control the situation. Maybe start with you and another guy and see what happens next...