UPDATE on April 10th, 2015]
Nichgamer has gotten a clarification for Twitch’s stance towards Senran Kagura: Estival Versus. Apparently, users are allowed to stream the game, but the moment “sexually explicit” acts or content are showcased, they are grounds to have your stream closed, or your account banned.
A Twitch representative gave the details:
“Senran Kagura: Estival Versus is permitted for streaming, but you still must adhere to our Rules of Conduct when doing so. Per our rules regarding sexually explicit acts or content, the sexually suggestive scenes in this game should not be the focus of your stream.”