Hi@ joossa and rick:
i agree with the whole text.
But: I always see them calling
Other people will be confused. Yes. Some will even ask if their males do it, too
fisherman brazil will know what he has to do
Calling females are not fertile, not depending on how many times they were mated "correctly". Mating which looks correct do not have to be correct. Some males are just infertile, for example
Waht is completely correct is that males do not care about calling but will mate any time as often as they are able to. You know: Some of my males try to mate other males, for example
Of course there is scientific literature on it, but it is expensive
regards