Quote 3
On the Generation of Animals 729b22
"On the facts too, what happens agrees with this argument. For this is why certain males, even though they couple with the females, are seen to put no part into the female, but on the contrary the female is seen to put a part into the male, as is the case in certain insects. For the effect that the seed, in those that emit, brings about in the female, is brought about in these insects by the heat and capability in the animal itself when the female brings into it the part that is receptive of the residue. This is also why such animals are joined for a long time, but when separated generate quickly. For they remain coupled until they have constituted the matter in the way that semen does; but after separating they emit the foetus quickly because they generate an unperfected offspring; for all of this sort produce grubs."