Also, why do they always say "Spill" your seed? That seems a bit too poetic. I mean, guys don't just go 'whoops accidentally spilled all my sperm, better go mop it up.'
Because back in the day, everybody stored their jizz in buckets and just like sorta poured it into the girls.
And then whenever they knocked that stuff over it got all over the floors and God was all like "Guys, that's gross what's wrong with you."
So he made it a sin and everybody was all like "Oh stuff dude I don't want to go to hell."
Then everybody accidentally knocked over their semen buckets in their panic and there was jizz everywhere.
True story.