Jeeze louise, someone's uncomfortable with mythological, anatomical, and psychoanolytical basics. The spear is a very classic phallic symbol, also used to suggest domination and male fertility, all very fitting to Vivec. sixuality is nothing new in the Elder Scrolls mythos, and is older than dirt in real life cultures (Zeus slept with anything with a hole between its legs, the Egyptians believed the world was created when a god mastvrbated, etc.). Pretending that Molag Bal, the King of [six without consent], used Vivec's body gently with his literal spear is just willfully ignoring the whole sermon. Is it smut? Yep. Does that make it wrong? Nope.
From Sermon 14:
'I would prefer,' he said, 'some kind of ceremony if we are to be married.'
Translated: "Hey Bal, you're going to [six without my consent] me anyways, so how about some foreplay and a party?"
And the legions that took the feet were summoned again and ordered to begin a banquet. Pomegranates sprang from the badlands and tents were raised.
Pomegranates are a classic symbol of loosing ones virginity (see: Persephone).
The sons and daughters of Vivec and Molag Bal number in the thousands.
They got married, "loved each other briefly," and had tons of kids. Yep, godly gay six.
Vivec lay with Molag Bal for eighty days and eight, though headless.
You can bet he didn't just read stories.
His head found its body had been tenderly used. He mentioned this to Molag Bal, who told him that he should thank the Barons of Move Like This, 'For I have yet to learn how to refine my rapture. My love is accidentally shaped like a spear.'
His love(-making organ) is shaped like a spear. He used Vivec's body. Roughly. He is the King of [six without consent]. Can't get anymore obvious than that (unless you want "and then Molag Bal shoved his throbbing-" [this passage has been sensored for your sanity"])
So Vivec, who had a grain of Ayem's mercy, set about to teach Molag Bal in the ways of belly-magic. They took their spears out and compared them. Vivec bit new words onto the King of [six without consent]'s so that it might give more than ruin to the uninitiated. This has since become a forbidden ritual, though people still practice it in secret.
V and Bal took out their spears, that is their love(-making organs) and compared them. Vivec bit Bal's 'spear'. It became forbidden, but people still do it. Do people go around biting pieces of wood tipped with metal, or is this an extremely transparent metaphor?
The Velothi and demons and monsters that were watching all took out their own spears. There was much biting and the earth became wet.
Apparently, biting weapons causes them to expel liquid. hm...
Vivec wept as he slew all those around him with his terrible new spear. He named it MUATRA, which is Milk Taker,
So Vivec bit parts off from Bal's 'spear' (not quoted) and made his spear more terrible. He named it Muatra, cause guys apparently do that sort of thing.
Notice also Sermon 9:
Vivec had to stuff her mouth with his milk finger to keep her from singing Veloth into ruin.
And then we get to the Trial of Vivec:
Vivec assembles a spear from the bones of his armor.
Vivec: "Here, this is Muatra. Guess what it represents."
Vivec stuffs Muatra into Azura's mouth. Azura chokes!
[edit]Gah, the 4 letter word that starts with R and ends with Ape is censored :/
[edit2]So, basically, Muatra is both Vivec's dike and his spear, and he uses it as a weapon (sometimes unconventionally: see Barfok and Azura) on several occasions.