There was no conceivable good reason to do it. I feel very confident saying the people who want to see an Android 17 doujin would prefer him to be male. 17 and 18 are practically identical looking outside of their gender, so genderswapping 17 is bafflingly dumb. And then on top of that, to still give him a dick when he's a girl? Why, just what was the author trying to accomplish? I'm very disappointed to see this.