Breeding biology ch.2

While Monsters as a species are diverse to the point where they were initially mistaken for a collection of species rather than a single one (see the next chapter,) they do have many behaviors in common. This chapter will list a few.

Races of Monsters tend to come in a single gender, with only a few barely-researched cases of a single race appearing with both genders represented. As such, it is generally not possible for a population comprised of a single race to survive indefinitely, since the species reproduces sexually.
As an offshoot of this, most wild populations of Monsters tend to be a mix of two or more races operating together.

Monsters of both genders have exaggerated sexual characteristics, such as permanent erections in the case of masculine Monsters or large breasts in the case of feminine Monsters. Additionally, most masculine races appear closer to non-human vertebrates, while feminine races nearly exclusively appear as humanoid creatures with traits comparable to those of various animals.

Monsters of a masculine race tend to seek out feminine mates, while Monsters of a feminine race generally tend to mate both masculine and feminine mates. There are some isolated reports suggesting that some individuals belonging to one of the masculine races seek out masculine partners as well as feminine ones, however none of these reports have been confirmed to date.
Notable fact is that Monsters of a feminine race can procreate with members of any masculine race, where generally the race of the offspring is dependent of their gender and that of their parents. Per example, a Catgirl (feminine) mating with a Dickwolf (masculine) will only have either feminine Catgirls or masculine Dickwolves as offspring (note that some individuals have a mutation that causes the race of their offspring to be entirely random, see chapter 4: inheritance and mutations.)
Another noteworthy observation is that, while Monsters are generally indiscriminate in their choice of partner, incest only occurs under exceptional circumstances. Monsters with less than four degrees of separation between them seem to be instinctively aware of this fact, both in the wild and under controlled circumstances, as proven in the Fornusson experiments (see note 1.)

A group of Monsters is officially referred to as a Fable but more commonly known as an Orgy, and tends to be comprised of both feminine and masculine individuals in a ratio of roughly 3:2. In the vast majority of the cases, the masculine members of the Fable tend to act as leaders, though it has often been observed that the feminine members would persuade the masculine members to change their decisions, both through (feigned) aggression or sexual favors.
Fables tend to stay in a single area for up to a year, moving only when there is a clear danger to the Fable as a whole, or simply at the end of the year. In either case, the entire Fable moves out of the area in search of a new domain.
The domain of a Fable is defended fiercely against outside intrusions, with the sole exception of intrusions by other Fables. If another Fable trespasses on the domain of a Fable, the two groups seek each other out, exchange several members, and eventually go their own way. Given this fluid nature of Fables, it is extremely difficult to identify which Fable keeps the land and which moves out.

All Monsters are always prepared for sexual intercourse. In masculine races, this shows through the permanent erections they all have, while feminine races require little more than casual contact to enter an aroused state. Despite all this, it is quite uncommon for a feminine monster to become pregnant, With the average rate of success being somewhere below 10%. Monster pregnancy seems to last for at most a few hours, and the newborn offspring matures in mere minutes afterwards. Interesting detail to note is that there is no registered case in which a masculine Monster caused a pregnancy after pulling out prior to orgasm, regardless of prior insertion. There is much debate among scholars whether this means that interruption of coitus is a valid method of birth prevention for Monsters, or whether the feminine Monsters give some subtle clue when they know they’ll get pregnant that makes their partner not pull out. To date, no experiment has given any conclusive evidence either way.

(note 1) Prof. Fornusson of the Monster research facility at Pervert’s End conducted an experiment in which the offspring of a single pair was separated, and bred further. Even after three generations of separate breeding, the members of one branch were offered a pair of potential mates, one of which belonged to the other branch while the second belonged to an entirely different Fable to begin with. In all cases, the members of the first branch would choose the members of the unrelated Fable.