Why do girls love guys who sing like girls?

why do girls flat out adore guys who sing like little girls? you know the type of artists im talking about: justin beiber, new kids on the block, backstreet boys, 98 degrees, boyz 2 men, etc. i thought mother nature intended girls to be attracted to masculinity, and guys to be attracted to femininety...that being the case, you would think singers with deep baritone vocals would be on the cover of tiger beat, seventeen, and bop...but its the total reverse. teenage girls mysteriously love men who sing like Minnie Mouse after inhaling helium. why????