I mean technically, as far as i know, all game events depend on some specific day and time, or some another event to happen. I might be wrong, since i'm not dev, but at this point it shouldn't even matter. As i remember it, when I was playing, i just got all 4 limbs, connected them, and got the cowgirl pose right after that. Just get all limbs and play a bit, it must happen sooner or later.