The book opening up is maybe a better option.
There also exists a dutch book: Love unlimited - Leonie Linssen
It is a book with +- 10 practical examples.
I'm not sure the english version is already available. It should be available since 2010. I think it is a really helpful and understanding book for sorting out al different kinds of problem. They also have a case about swingers.
Thanks for the post.
For the coming weeks I need to focus on study so I wish you good luck.