If you are male and you walk out and the next time you have sex with a woman you get images of the overweight woman masturbating with a carrot then you are probably bi. Being able to get anything up after watching an event like that may be because you are straight BUT having re-occurring nightmares when having sex may be a guilt trip on your behalf, leading to being gay. At the moment you are bi, on the picket fence of sexuality but leaning towards the homosexual side. (The picket fence is sending pleasurable sensations up your backside too)
If you are female and retch in the booth running out screaming with your hands covering your eye's which feel like they are burning from the images you have just seen then you are straight.
If you are female and are able to last the full 30 seconds, and walk out feeling ok then perhaps you are bisexual. Or you have too much testosterone. Or you're a nurse. (It's all the same really)
If you are female and put another $2 in the slot for purposes other than laugh out loud entertainment then perhaps you are lesbian. Because watching a middle aged woman masturbating so voraciously that you think she is going to start a tinder fire within herself is perhaps the most accurate description of what a true butch lesbian looks like. And being able to watch somebody do that for another 30 seconds without the bile rising up at the back of your throat prepares you for what a lesbian encounter will realistically be like.
If you are a guy and have a boner at the end of the thirty seconds then you should seek psychiatric help. Fast. If you put another $2 in then perhaps you would be better suited to pay for sex.
I never said that it was going to be pretty. It's the kind of method where you throw somebody into the deep end of the pool and see if they float. But at least its cheaper than enrolling into a new religion like Buddhism so you can learn about the path to enlightenment. The path to enlightenment is easy and sleazy. (and only takes up 30 seconds of your time) Just look for the giant neon signs saying "$2 Live Peep shows" You wont regret it.