The figures were obtained by BuzzFeed News from a confidential EU report, and via a high-ranking German politician.
Instead of safe words, Kristina Marlen goes by the stoplight system.
"The culture of silence must come to an end," German Green Party MEP Terry Reintke told BuzzFeed News.
"We are the other 87 percent."
"Society is changing. We are changing it."
Marriage equality finally came to Germany after decades of struggle on Friday.