"They have to be female," he explained, "I have to extract samples of different types to make sure that nothing volitile will happen when the cells connect." He explained. Since enigma was a woman, the tests would have to be on women. He knew everyone was different, individual, which was why he was going to get samples from enigma as well, further on in the testing process. When she mentioned not having sex for a while, Bruce shook his head, "we can still have sex, that's not the reason for this experiment," he said, looking down at enigma, curling an arm around her, pulling her close, "it's to see if ill be able to have offspring without making my partner die from radiation sickness."