The Mail are fishing for anything they can get about the victims to try to give the story legs. Presumably this story will run at least until the perpetrators are identified and tracked down, so it needs filler until that happens. In the meantime, any salacious gossip or titillating detail they can buy will be spun into another day's story about the victims. They're lesbians: any relationship history the paper can unearth, however mundane, will be spun to sound as titillating as possible.
These women are not just the victims of a violent attack, their lives have now been fed into the tabloid machine and they're going to suffer a couple of weeks of stories that even they will scarcely recognise as referring to themselves.