Very strange ual response? Does it make me un-straight ?

Your hormones are at a peak. Confusion is part of the deal. If you feel like being bi for a while go for it. It is only . No one is killed and body parts dont fall off. If the roommate flirts again move on it and do some kissing and touching. If you get tipsy at a party and like a guy move on him a little. Same with the guy... kiss and caress. Helping a guy or girl make you feel ually pleased is YOUR responsibility. You have to explore and find what you like.