On the endocrinological bit, it would be interesting to do a study with some participants receiving placebo. Has that ever been done? Is that even allowed by ethics and stuff? I feel like it would be unethical.
Oh yeah, and it would be interesting to study agendered and genderfluid people more.
My current dorm has a mediocre shower, which has a bit of trouble if both are in use at once, and which changes temperature when somebody flushes a toilet.