Therefore the Natural function of eating is for fuel.
True.
Hold them spices!!
Doesn't contradict the premise.
If you know another purpose for the reproductive system, let me know. Right now, you're rationalizing.
Onan is the ONLY, not the most obvious.
So it's not valid? Your premise is invalid.
Is embezzling wrong? It's not mentioned at all in the Bible.
And in that example, a larger law is being disobeyed.
This is a novel interpretation that has only come around in the last 70 years, since the Church of England became the first Christian sect to permit artificial means of sterilization.
Read the red text - no 'interpretation' needed.
They WHY is there such a thing as a female orgasm?