Indi_growgirl is right, you can certainly get "regular" autos which have a chance of being either male or female. Most of the rest she wrote is correct, except for the part she thought was bs too, about the roots of autos flowering, that when the roots hit "obstacles", that this causes flowering. Autos will flower regardless of how much light there is and flower "automatically" when the reach a certain age - roughly 2-5 weeks after germination. Cannabis Ruderalis, which is responsible for the auto flowering genes, come from northern Russia where the warm summer season is very short, so as a survival instinct they have evolved to flower as soon as possible, 2-5 weeks after germination. This early flowering allows the plants to make viable seeds before winter starts again.
Photoperiod (fem) seeds and "regular" photo seeds rely on lengthening night/dark periods and shortening day/light periods to trigger flowering - as in Fall/Autumn is approaching. Photoperiod are usually better yielding plants and generally easier to get good results with, so if you are more comfortable with these, I would suggest that you continue with them. Personally, after experimenting with autos and being an outdoor grower, I think I will stick with photo fems. Autos are better suited to those with cheap electricity and lots of lights, otherwise they can stay too compact before flowering starts. Hope this helps... Organoman.