This plugin will move/add users automatically to certain group based on their gender.
To install this plugin, log in to your Admin Panel, go to System->Plugins, click the Install New Plugin button and import the plugin 's xml file.
To configure it, go to the plugins page and click the edit icon of the Gender Group plugin. There you can enable/disable it, select the gender profile field and the gender groups.
The text in the male/female gender field, must match precisely that of the gender field that you have set up. In the plugin by default it is set to Male and Female, which is how I have set it up. For example, if you have those field set to Man and Woman, then that is what you should enter.