Why teenage girls these days becoming bi curious or biual?

okay so I'm in a new school and I'm a 15 yr old girl.. oh well. we share all one cl together but we're not family. they have cliques but I'm all friends with those cliques so I really know what's going on.. okay so like we have 16 girls and I found out that 8 of us is either biual or bi curious.. there's no butch... we're all feminine and the other 10 is open minded about this stuff.. well maybe not all but most.. Why teenage girls these days becoming bi curious or ?