Is it only other girls that actually think monroe piercings look good?

They look terrible. A woman needs to be extremely attractive to actually "pull it off" but even then it still detracts from her looks. As a girl I know full well how paramount it is for us to attract the spotlight and be the center of attention, and this is just another attention seeking shenanigan; one that will look terrible when the unsuspecting bimbo turns 40 (unless she plans on auditioning to play an extra in a zombie movie).