We, as humans, are a biased lot. We only classified those things that required classification. We have also not taken into consideration that literally anything and everything could have a gender in this universe. The following amazing theory was put forth by Ashvni to classify the word 'it'.
Anything that cannot be put under a 'he' or a 'she' must come under a 'fe'. Fe has the following properties - it can mate with a he, she and a fe. On mating with a he, it gives a she. Conversely, on mating with a she, it gives a he. Also, on mating with a fe, it produces one of its kind. This is its mechanism to sustain its population. Fe's can be anything and everything - the moon, stars, grass etc.
Hence humans can now mate with anything to sustain their kind. The mating process will be discovered shortly and put up.
