This group pretty supports any kind of relationship between Kagome and Sango wether it be in a romantic, sexuall, friendship, sibling or any type of manner that you can come up with. So it's pretty much for anyone who likes Kagome/Sango, not just those who see them as a romantic or sexuall couple, ANYONE who likes Kagome/Sango, pretty much no restrictions. So even people who just want to draw friendship art or write friendship fanfiction with them can also join this group.
I hope that answers your question and if you want me to explain or elaborate if there is something in the answer that you don't understand then I'll be glad to do so.