Still better than my level of personal hygiene today in the morning. I just sniffed myself here and there
I'm not sure if this is going to answer your question about slow loris, as a large part of the story is a sweet secret (sweat secrete?) of Nature's underpants gnomes.
The venom production is due to a convergent evolution (whatever the word "evolution" means today). The same genes encode venoms in snakes, lizards, sea creatures and even the few venomous mammals (platypuses). After all, there's a narrow group of proteins, which are venoms, so trying out different configurations of genes, different animals can eventually achieve one which encodes them.
When it comes to slow loris, I've found an article which says that it's more likely a strong allergen rather than venom, and it's similar to that from a cat's saliva and skin glands: http://www.columbia.edu/cu/chemistry/gr ... lergen.pdf
Both creatures lick their glands during grooming.
The slow loris will hide their head and neck between their arms to protect the vulnerable parts when attacked. They must have somehow figured out the rest, with a little help of natural selection (lick your glands before you bite, or you'll be eaten - or something similar they could teach their children or each other via social learning).
BTW, convergence is a fascinating mechanism. While it's quite obvious that e.g. whales look similar to fish, some doppelgängers surprise, e.g. African crested porcupine and New World porcupine:
They look strikingly similar, but the only thing they have in common is a hairdresser - they evolved independently on different continents and from different ancestors. BTW, there's a so-called cobra hypothesis about loris, which assumes the convergence mechanism:
(https://news.mongabay.com/2014/09/did-t ... the-cobra/
I like looking at people and their pets. They often look and act very similar.