Simply put, these movies all largely deal with the connections between a group of three female characters.
Ladies in Love: Martha Kerenye (Janet Gaynor), Yoli Haydn (Constance Bennett), Susie Schmidt (Loretta Young)
A Letter to Three Wives: Deborah Bishop (Jeanne Crain), Rita Phipps (Ann Sothern), Lora Mae Hollingsway (Linda Darnell)How to Marry a Millionaire: Pola Debevoise (Marilyn Monroe), Schatze Page (Lauren Bacall), Loco Dempsey (Betty Grable)
Three Coins in the Fountain: Maria Williams (Maggie McNamara), Anita Hutchins (Jean Peters), Miss Frances (Dorothy McGuire)The Best of Everything: Caroline Bender (Hope...