http://michinoakio.blogspot.kr/2016/12/ritz-senseis-blog-post-161227.html

Ritz recently made a very long blog post where she talks a bit about the Saki live-action and answers a ton of readers' questions. This is a summary (it has nearly all the questions though). Any text in italics is mine, usually to clarify something. Everything else is a summarized translation of what Ritz says. It's quite long so most of it will go after the break.

- Who has a boyfriend and who is not a virgin?
There's no good way to answer this question but I'm going to answer it anyway:
No one has or ever had any boyfriends and because of their age they are all virgins. Hayarin's granma too, Tsuyuko (Kuro & Yuu's mother) too, Ayano (Shizu's mother) too. I don't care if it's not realistic.

Ritz-sensei is a yuri fan through and through.