Have you checked if the other dog is neutered? If he is, there shouldn't be a problem.
However I have to agree with YLL that the importance of getting a dog altered and possibly saiving a life is more important than getting more dogs. Maybe you could get a job and work towards fixing the dogs? You have no idea how much money it will save in the long run. It will also solve behavioural issues. Unspayed females all together can be unpredictable.