Male and female bettas should NOT be housed together! They are VERY aggressive and will wound and/or kill each other! Please remove the females ASAP before someone gets hurt!! I noticed in another thread that you have a 2 gallon that you keep these guys in. In a two gallon, nothing can be kept with a betta, it is too small. Please take the females out and put them in a different container or return them to the store.
is more info males and females together. And here
is a thread with extra information.