Dead shows, my beloveds💕

Valveplug

Valveplug is the most common form of interfacing. It involves the spike and the valve.

Interface Arrays

Interface arrays are the specific arrays located at the pelvis that hold the materials required for sexual interfacing. Cybertronians are hermaphrodites, meaning that they all have both external and internal sexual organs (like snails). While humans assign gender based on biological sex, Cybertronians have a much looser view when it comes to gender since it can only be seen in the processor (smthn about femmes having a processor similar to Solus Prime because they are descended from her). It also makes transitioning gender easier because there isn't much needed to change on the outside.

When the interface materials are not in use, they are covered by panels known as "interface panels," "spike panels," or "valve panels." The panels can either open upwards or sideways (like doors at a grocery store), it depends on the Cybertronian. Cybertronians can open their panels at will, though sexual stimulation may cause them to open automatically. The valve gaining lubricant, sometimes from sexual arousal but not always, doesn't usually mean that the panel will open, but the spike nudging against the panels (again, a lot of the times from arousal but not always) will cause the panels to automatically open. When the panels are closed, the spike retracts into a space called "the spike orifice." When the spike is in its orifice, all sensory nodes are shut off, and the Cybertronian isn't able to feel anything while it's in there. Panels can be open to reveal just the valve, though both the valve and the spike will show when the panels are fully open.

Made-to-order Cybertronians (MTOs) are very often built without interface panels. If they wish, they are able to get interface panels installed by medics. Sometimes, empurata procedures would remove the interface array altogether.

Outer Mesh

The outer mesh of a Cybertronians interface array is similar to cesium, though it is much more durable than actual cesium and won't melt at room temperatures. While soft and flexible for Cybertronians, the material is considered hard (not in the sexy way, the "this is just actual metal" way) for humans and other organics. Still, the mesh around the valve is some of the softest on the frame, only rivaled by the plating on the face.

Spikes

Spikes are the external sexual organ that Cybertronians have. It's similar to a human penis though there are some differences (and not just with the size, obv). Spikes, being made of metal obviously, are much firmer than the average human penis. They're also a more diverseity than the average human penis, with different shapes and biologhts, and colors that depend on the frame, alt mode, or region.

Unlike humans, spikes don't also attach to their urethra (or waste tanks/waste orifice here. Cybertronians poop and pee through the same hole, like a bird. Don't think about it too much).

The spike is covered in sensitive nodes with the main nodes being at the tip and less-sensitve nodes being located everywhere else. At the head of the spike is a small (small for them, large for us) slit where lubricant comes out from arousal or an overload.

Erections usually from sexual arousal, but not always, basic stuff taught in sex ed classes if they were actually good. I'm bringing this up because when a Cybertronian gets an erection, it's not from blood (they don't have that) but rather an electric charge going to their spike. Generally advised for spike-in-valve interfacing.

Overloading through the Spike

For those who don't know or who haven't figured it out; overloading is the Cybertronian term/equivalent of an orgasm.

Cybertronians don't ejaculate sperm as sparklings (baby Cybertronians) aren't made from valveplug interfacing (they're made from sparkmerging, which has only a 30% chance of success when making a new spark. The chances increase depending on the number of bots present). Instead, it's just excess lubricant that comes out. Ik a lot of people make this lubricant energon, but that just seems like a waste of energon time me and Cybertronians are shown to be able to cry and produce lubricant, so it just being regular lubricant makes sense to me.

Valves

Valves, sometimes refered to as the interface valve bcuz valve can refer to multiple different holes in the frame, are the internal sex organs that Cybertronians have and is located under the spike and overload node. The overload node is a spot on the interface frame connected to the valve and is one of the most erogenous zones related to the valve.

Valves function similar to a human vagina but, being that they're giant alien robots, there are differences. For one, Cybertronians have much smaller labias compared to their body size. They also lack a clitoral hood (I guess overload node hood in this case) since their panels already protect the overload node from external factors.

The opening of the valve is simply called "the valve entrance." Most of the erogenous nodes can be found on the inside of the valve, with the most erogenous being the overload node. Most of these erogenous zones are attached to calipers located inside of the valve, which are meant to easily grip onto the spike when engaging in valveplug. Valves have a bit more erogonous zones than the human vagina though, like humans, the most sensitive one is the overload node.

When a cybertronian is sexually excited, the valve produces lubricant. It's the same kind that the spike releases when overloading. Overloading through the valve creates an excess of lubricant that comes out of the valve.

Valves don't have as much diversity as spikes. The main difference about them tends to be the biolights. Most interface arrays have biolights. Biolights serve no purpose other than to indicate arousal. It's very common for them to light up fully during an overload.

Random Note (or notes depending on if I come back to edit this more)

It's possible to overload from both the valve and the spike at the same time, though that often results in overstimulation

Cybertronians ended up developing interface arrays purely for social bonding purposes

Refractory periods

Humans with penises have longer refractory periods, while humans with vaginas are sometimes capable of having shorter refractory periods and orgasming multiple times in a short amount of time. Cybertronian refractory periods are more about cooling down overheated systems. Once the systems are cooled down, the refactory period is over. This lasts about 5-15 minutes, depending on the bot.

Sparkmerging

Sparkmerging is when two or more Cybertronians touch their sparks together. The act doesn't always have to be sexual, but it can be. This is different from sparkbonding. Sparkbonding is when two Cybertronians show their sparks to each other and is often a ritual shown in amica endura rituals. Sparkmerging is actually touching the sparks together. This is usually done with bots that have very close bonds or with romantic partners. The touching of sparks can create an intense feeling between the two bots as memories and feelings of the other are mingled together, and it can sometimes result in an overload, this time coming from the spark instead of from the interface array. Some bots put this in the overstimulation category since the feeling of life forces interacting, feeling your and other's memories ten-fold, and then overloading can be too much.