Ok...Try to follow me here...you know of Alternate Dimensions, right?
Well, the plot basically boils down to..what if you were transported to another dimension, a dimension very, very much like our own..with one difference...everyone's gender is flipped! Including yours! (Which means that in this dimension, there is a Male version of your character). What do you do when you meet this version of yourself..and find yourself falling in love? *gasp*
Another idea, on much the same principle, involves a female scientist creating a male clone of herself, and finding that she's rather attracted to him...
Complicated, I know..but if you're interested, PM me.