I saw this post linked by another post. Somebody asked earlier how to switch the side of the male and female connectors.
I recently posted the solution in another post.
When you place your splitting plane, the purple side of the model will get the male connector, and the blue side the female connector. If the wrong side has it, flip the splitting plane 180 degrees and it will switch the connector to the other side. Make sure you are switching one of the two axes that flip the plane instead of the third one which will just rotate it and have no effect.