people on this wedsite are so inimaginative. When you write a girlxgirl fanfic theres no man.  So theres should be no problem having diffrent character be the "dominant" in the relationship, meaning the one who is more lean to take action.

Taeny by exemple, people are so used to have taeyeon has the "man" in the couple that they keep doing it. And if you dare put tiffany has the "man" you get a tons of comments about how it doesnt fit tiffany or they wish it was taeyeon since tiffany is more girly. 

Kryber is probably the worst ship when it comes to this problem. Everybody knows Amber is not a boy, but somehow some writers still see her has a boy....