I want to know the answer to the following question:
How would the marriage of a man and woman on the ship serve as a fertility ritual?
All the background I'm provided with is that "Also there are some indications that the effigy of Nerthus or Freyr was placed on a ship with wheels and accompanied by a procession of people in animal disguise and men in women's clothes.". Is that enough to answer the question?
Answer: no