Hey, I put bone meal around the plants a few days ago (phosphorus), and also trimmed off the ends of the vines. I read that both can stimulate female fruit production, and guess what? I finally have a female fruit that is large - nearly 2" long - and ready to flower! Yay!
This is so cool. I hope I can get at least a half dozen mature 'sponges'. If so, then I'm going to use them as Christmas gifts for people.