WARNING: The following material has not yet had a chance to become canonical.
Nayabaru are at the opposite end of the scale to kavkem sexuality when it comes to using sexuality purely for social nicety - it's not so much offensive an idea as it is literally unthinkable. For Nayabaru, genitals exist for two purposes: Masturbation and procreation. There’s no middle ground - no friendships with sexual components, no companionship where sex fills a stress-relieving role.
Nayabaru have a strong urge to procreate, but this urge is rare, and a Nayabaru can go a decade without feeling any such urge. The longer the Nayabaru has gone without copulation, the stronger their procreation urge likely is.
That said, despite this being their urge, since Nayabaru lay eggs in clutches, to keep a stable or only slightly growing population, it would make no sense for all Nayabaru to procreate.
The Nayabaru have solved this problem as they have solved many other problems: With biochemistry. In this particular case, the solution is contraceptive (orally administered) and its ritualised use is ancient enough that it's considered an important tradition that likely won't be changed in favour of even more radical approaches (such as the suppression of the urge to procreate altogether).
It's worth noting that Nayabaru do not form families. They do not live together with loved ones and they do not raise children together. Children are raised by specific Nayabaru that are specialised for the task of Raising Children, educating them and molding them into respectable Nayabaru (where their instincts have not already taken care of this). This means that procreating with someone whom one is not particularly fond of in other circumstances is not very bothersome for either gender, as long as their genetic fitness is assured.
As such, the Nayabaru engage in a community-wide breeding ritual to procreate.
Breeding ritual(s): Taro
Unsurprisingly, it's the Lashala that organise Nayabaru breeding rituals. These events are called upon whenever the Lashal believes they should start organising the next generation of a particular profession - this is usually a regular occurrence in the tune of once every five years (in fact, it's not uncommon for most communities on a given continent to share the cadence), but might also be arranged out of order. Any Nayabaru interested in the event may join it - there is no particular age bracket to be considered, nor does the Lashal restrict the ritual to Nayabaru specifically useful to the task they're pursuing.
A breeding ritual lasts two days. At the beginning of this timespan, the Lashal assesses the usefulness of the present Nayabaru for the task they hope to achieve, and then gives out either a placebo or the functional contraceptive to the present Nayabaru (making sure to give out a few extra placebos to some of the females for fallback breedings, allowing a modicum of non-engineered variety). The viable Nayabaru the Lashal then retains in their head. Depending on how many of the present Nayabaru are viable for the Lashal's purposes, each Nayabaru is given a number of mates to procreate with - at 50% viability, two mates, at 25% viability, four mates, at 10% viability, ten mates.
The mates are all assigned by the Lashal, though in some communities each Nayabaru may voice one preference, should they have it - there is no guarantee they will be permitted to indulge in it, but the Lashal will consider it, and it is granted often enough (if it is vetoed it is likely because both participants are fertile, but would are assumed to not be a good genetic match for each other).
The Lashal will make sure that at the end of the two days (the timespan allows the contraceptives to work, sabotaging fertility as necessary), all virile male Nayabaru will be mated with at least one fertile female Nayabaru, but that no one viable Nayabaru mates only with other viable Nayabaru.
All in all, this is a pretty challenging combinatorial task, but Lashala are good at it.
The aim of the ritual is that at the end, no one will know who the father or mother of the viable eggs that were laid is (except perhaps the Lashal, depending on pairings chosen). Even females receiving contraceptives usually still lay eggs, and these are gathered to be raised just the same - tracking them is practically impossible.
Should a female not produce eggs at all, this would be considered mere bad luck - the way the ritual is laid out and Nayabaru biology works, remaining unfertilised and laying no eggs despite being fertile is very nearly an impossible scenario, but the instincts that accept this outcome stem from their ancestral environment (when there was one mating and then either a clutch of eggs or none).
The ritual manages to reliably suppress the males' urge to procreate for another decade or so. Females are marginally less likely to leave the exchange satisfied in this manner, since in edge cases it's entirely clear they failed to procreate, but even those who don't accept this for 'another decade or so' are still kept quiet for several months at the very least. This is typically balanced by that female Nayabaru tend to be satisfied with fewer breedings per lifespan, so that breeding rituals normally do have about a 50/50 male/female distribution.
Nayabaru sex is fairly slow (taking about 20 minutes - without any frills, bells and whistles) and they would describe the experience as relaxing rather than exciting. They have rather shallow but long-lasting (five minutes or longer) orgasms that are basically guaranteed to happen during sex.
They don't really bother with foreplay - with the rest of Nayabaru sexuality fairly masturbatory, every Nayabaru is expected to get themselves ready for sex.
Like most animals, Nayabaru will occasionally have sexual urges (as opposed to the procreation urge mentioned before). To them it's entirely natural to want to take care of them oneself - masturbation is consistently slightly more pleasurable than sex and so generally the preferable way to deal with it, even without social constructs enforcing the matter.
This is such a natural matter to Nayabaru that they're not perturbed to see another masturbating in 'public'. It's verboten to masturbate while you are doing your job, and you're doing your job most of your waking hours, but if you're taking an official break, it's your evening leisure time, or your morning routine, you can masturbate wherever you want and it won't bother anyone (as long as you clean up after yourself, obviously).
This blasé attitude is somewhat encouraged by Nayabaru biology - given the gentle nature of Nayabaru sexual sensations, it's very rare that Nayabaru feel an urge to make loud vocalisations, meaning they tend to stay quiet and fairly still while they masturbate, which means they're usually not really bothering anyone, or drawing attention to themselves in any way.
Nayabaru are even more aggressive when it comes to non-consensual sexual contact than humans, owing to that any sexual contact between Nayabaru is assumed to lead to procreation, and this is not a decision to be made on a whim - nor in fact by either party involved in the sex act, as far as Nayabaru are concerned.
If someone initiates unwanted sexual contact with a Nayabaru, they may literally find themselves killed for their trouble. The circumstance is considered heavily mitigating - it's one of the only forms of murder that Nayabaru culture may potentially forgive. Needless to say this doesn't really happen, however.