He doesn't specify.
Q. Do androids, as well as Adam and Eve, have reproductive organs? Do they use them?
"They do not have them right after their ‘birth’. Since reproductive organs were hidden in most of the information from humans, they failed to copy those organs. However, during their learning process, they may gain body parts that serve as reproductive organs. Since they can copy anything, they can create semen, change their sex, and even mimic pregnancy to a certain extent, but since they cannot become truly organic lifeforms, they will not be able to undergo insemination or mitosis. They can only create very convincing imitations of the real thing using other materials."