In general, I think it is a mixture of both. Some things are clearly roleplaying, such as Lumi and Jelly flirting when Jelly is otherwise known for being, ahem, not homosexual. Some cases are more likely to be genuine, like Pippa obsessing over Bismarck even before she joined Phase, or the girls who went to gay bars IRL. But then again, unless one of them gets to the point they start Kelseyposting, what does it really matter what their exact sexuality is?