Keeping things interesting

My wife and I do a lot of dirty talk and sexting. It is a huge turn on to see some of the things she wants to do with me and other people. Since we started doing this we have had a lot more fun in bed. She often tells me how she wants to have sex with other men while I watch and participate in group sex with me. That is something I hope we could do in the near future. Some other things we do to keep things interesting is wearing lingerie. I dress up in a thong for her and she fucks me with a strap on. She tells me that she wants to see another man have sex with me. It seems like that is her #1 fantasy as of now. What are some other things we could do to keep things spicy?