For a concise history of gays in the Middle Ages, I highly recommend "Christianity, Social Tolerance, and Homosexuality" by the late Professor John Boswell. The book is a must read for those interested in the plight of minorities, especially gays, in Medieval Europe, and how they became targets for oppression. I have included an excerpt for you to read to hopefully encourage you to read the book.
I have answered my position on female rulers in other threads. And I am excited that Cool Toxic's project will have both male preference cognatic and absolute cognatic primogeniture.