well I've had 25 years hunting experience or I did earlier on when foxes were worth big $$$ - always been lured by the $
anyway in the wild I witnessed the odd wood and black buck mating habit. so here's what I think.
normally the removal of the underwear would help BUT ducks approach this ritual fully feathered/clothed with a mount from behind and wickedly quick side on movements/thrusts and follow it off with a good old full body shake! not to be confused with a buck rabbit either! after the party he just topples over like some-one has shove a long stick up his a$$
never mentioned before on the forum but In a previous life I had the odd patient bring along drawing for me to decipher. at times the news wasn't good - famine- locust plagues - etc. I too get the odd drawing - like SE's Lotus- Abarth etc some good and some bad. again hard to decipher at times.
but back to this event. although on a different canvas this is more of a showing of virility and dominance and I and my past experience from the unknown feel that the DUCK slipped silently and in a side way motion through the outer garments and scored big time.
now I am not a detective either so only going on one photo is not enough to make a full BLOWN decision. I can only guess that it was a heated affair and looking very carefully at the evidence before me - no nest was built!
and it was more a clash of passion.....but no end fruit!