Sex Room? 🤫🤷‍♀️

We are currently putting a two floor 20x30 foot addition onto our house. The downstairs is a large living space with bar, fireplace, seating area, etc. Above that we are putting in a master bed, bath, and walk in closet. We are seriously considering putting in a bookshelf along one wall that you can walk through to have some…adult fun. Does anyone have something like this? Besides toys, any structures? We’d like a swing (not to swing lol) but we have two small children so a private area would be awesome for this…