I am having a hella of a time getting my male Panther to mount my female. Both are ready to breed, but he just dosen't want to for some reason. Two differnt sessions one time for 4 hours and another time for 2 hours but started to get agressive towards her on the last attempt. I have never seen a sperm plug in his cage. So does this meen that he might not be able to breed? HELP!