Forty years ago it was found that teen girls preferred teen boy singers with feminine characteristics, high piched voices and girly looks. When they begin to develope more the girls dump them and look for another girly boy.
Check out some of the 35-40 year old volumes of TEENBEAT, TIGER BEAT and other teen magazines of the 1960’s and 70’s.
You forgot the main teen girl group that was always changing members, Menudo.