The other thing you could do is purchase her a membership to some of the sites available for hookingup. I forget the names as I was once interested, but didn't want to pay to get more info and use their services (e-mail, pictures....) You could get her a membership to a swingers site and then let her look around from the security of her own computer chair until she finds something she likes.
As for setting it up, yeah, everyone here who's said it's abad idea, I have to agree with. Unless you and your sister are close enough to have sex in the same room as the other, you preparing all of this might offend her afterwards because your face, name, essence and energy will be written all over it and it could ruin it for her.
Good luck, I'm happy that you feel comfortable wanting to do this, but you did ask for our advice and this is it.
I hope you figure out what it is will work best for you guys andthat you both are happy in the end.
Oh, and if you really want to, maybe get your hubby one of those subcriptions to a swingers site while you're at it
