Norns need love

One of the things I've discovered in my last few months of playing Creatures is the Norns need for love, or more specifically, tickles.
At times I've found Norns who, despite having all their usual drives in the Health Kit satisfied, still have a big frown on their face and I took to trying to understand why.
Sometimes it might be something random in their chemistry, but more often than not I found a simple tickle or two tends to set them right and figured it must have something to do with the tickling process.
The main gene for tickling Norns is called the 'Pointer pats me' or 'user pats' Stimulus gene and decreases Need for pleasure, Pain, and Loneliness, while injecting a dose of Reward chemical.
I was already checking Pain through the Health Kit, so obviously my Norns weren't in pain. As far as I know Reward only reinforces behaviour and does nothing for happiness levels. So this means that if your Norn's drives have been satisfied and they still look unhappy, chances are they're either lonely or in need of pleasure.
Bringing these two chemicals up on the Science Kit biochemistry graph shows that, at least in my case, the Norns weren't lonely, but were in need of pleasure.

There are many things in the world that give Norns pleasure. Eating. Playing with toys. Pushing other Norns. What I've found though, looking at genes and monitoring things in the graph is that a Norn will fulfill these others needs well before reducing their Need for Pleasure to a minimum. This means that unless a Norn learns to over-eat, play when they're not bored, or push other Norns when they have a low sex drive, they're always going to need to get their pleasure from another source.

There seems to be two ways to deal with this. Either we need to go in and tweak the Norns genetics to increase the doses of Need for Pleasure (or we could do this via new toy/food cobs), or...we make sure to hug our Norns regularly.
Perhaps at some stage if I ever get around to making my own revamped Norn I'll try adding this in, but at least for now I'll just make sure to tickle my Norns more frequently.