Me (M24) and my Wife (F25) are wanting to try new things and a threesome is something we are super curious about. But like other than porn we've watched together we don't know anything about it. One of our biggest things is before sex ever happens we wanna talk to the other female to make sure we are all comfortable with what's going to happen. I'm just not sure about how things are supposed to go. We don't know if this will be a one off or not. We are still looking for a partner and we know the area and age we both feel safe trying to go after. Is there anything I should know or a Website (or app that's not tinder or like tinder) we could use to help?

Edit: I just wanna preference this really quick since I let her read. She isn't interested in another man that's why we are trying to figure out where we are supposed to look or what place we are supposed to go to in order to learn what we can.