Some silly people have tried having two females in at once but the only time i have ever seen this work is when someone has a rouge male that looks and acts like a female and has been with them from the start. The people that set up spawning tanks then add the male and 2 girls usually get a dead fish.
Also when a male has spawned once he will kill any thing until he has raised the fry to 3 days of age, so it is kind of impossible to spawn one female after the other in a row. If you try to spawn him right after he has raised the fry to 3 days he will probably die of starvation or tiredness.