Mating Question !

[Dejan Pavlovic]

...This will sound stupid .. Does female have to raise her tail when they are mating , or raising her back (with tail down) would be enough ? They have been mating four times (every two weeks, all night long) since we have them , still no pups , and we noticed that male maybe could not penetrate because of Female's tail , or we might be wrong ... The last time he mounted her several times , she shoved no resistance , but she never examined herself ... Do they know how to do it , is it possible that one of them is not fertile ? ... O.K. we have time (but you all know how does it feel to wait for pups) !!!