"... You.... uh.." There was no less awkward way to ask this other than to just come out with it. "You implied that you've been rooming here for a while and I just didn't notice... but you're... you're a..... you're a guy?"

Turning a bit pink in the face.

"You have to know what sort of problem that is..." Still trying to be vague and hoping he would just fill in the blanks. "Sometimes, girls need a little privacy.... to do... girl things.... you haven't been... in here... for um.. any.. of that.. right?" Like changing clothes, is what she was trying to ask though she was failing at it miserably.