Okay, I give up! What the Heck is this all about?

I know this is a bit off topic but I will admit I am completely stumped as to what the artist intended in the subject matter on this one. This painting is currently listed on an English Auction House site and at first I had a good laugh at the erotic meaning of the boy with that in-your-face pleased look on his face and the obvious phallic shape of that object protruding between his legs but then I just sat here trying to figure out what the heck was going on. What are they harvesting? My knowledge of how hops are grown on trellis' and the contents of the frame the kid is sitting on tells me they are sorting hops for making beer, although it could be a harvest of coca leaves and the boy is on a post consumption high and he is just happy as punch to see the artist with his own personalized sign of appreciation. What is the boy sitting on that protrudes in such an erotic fashion between his legs? Why is he posed in such an erotic defiant fashion? The artist has left us with an erotic mystery. Indeed, this painting obviously asks more questions than it answers. I can die happy now because I have seen it all.
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Caption: Female and Boy Harvesting Crops

Artist: Signature illegible
Medium: Oils on Canvas

Dated: circa 1918