This is about book, and what is missing from the films.
Laurie in the books is described to have androgynous and effeminate looks. Jo is also androgynous but she has sharper features. Jo in the books is never sexually attracted to Laurie, which makes it pretty crazy that so many adaptations have hired Jo´s and Laurie´s who have sexual chemistry. What Jo is attracted to is Laurie´s masculine energy and that in their childhood plays she doesn´t need to be a girl. Features that are traditionally seen more feminine that Laurie has, like his sensitivity bring out Jo´s nurturing side (something that came naturally to her).
In New York when Jo meets Fritz she is really attracted to him and his masculine looks (he is more build like a viking). Gender fluidly continues in the sequels. In little men it is once again referred how Jo prefers more "manly" boys. Little Men also introduces the character of Nat who is compared to Laurie. Nat has more effeminate looks, he plays music and he is quite sensitive. In Jo´s boys Nat and Meg´s daughter Daisy are in love but both Meg and Jo are worried since they don´t think Nat is man enough to take care of Daisy because Nat is quite a dreamer and probably because of his effeminate looks.
Jo however thinks that Daisy will be a good wife for Nat because she is steady and down-to-earth. When Nat returns from his trip to Europe and he is now more solidly built Meg and Jo give their approval. In Good Wives Jo wishes that Laurie could find himself a steady and a competent girl who could keep him grounded (sounds familiar?) The way Laurie was not used to making decisions also effected to the way Jo thought of herself. Which was something she wanted to change.
