Trying to keep it professional as possible

I work full time in a professional environment, I work 40+ hrs a week at a rate of 13.50 an hour, so I make around 2160 monthly... Which is not enough to live on where I am from. Im 21 years old and still live with my family but I've been trying to move out since I graduated highschool. I've applied for low income but everything I've applied to has a waiting list of 3-5 years... So I've applied for additional jobs but they always tell me that since my schedule at my first job is always changing that they wouldn't be able to have me even work part time with them. 
My SO told me that there were sites that I could sell pictures (that were revealing) and make decent money so that I didn't have to change my work schedule and now make enough to live on my own/ with a roommate. The only problem is that I haven't found any sites that I think are legitimate... And I'm also worried about my work finding out about me basically selling such revealing photos of myself... My question for you is, what do you think about working in a professional line of business and also selling pictures? Is it risky to do both? Is the risk of trying to make extra money by selling pictures too much and potentially get me fired from my professional job? If anyone has done this to increase their income while having a professional job, how did you make it work? Is this a good idea or are there better and less revealing ways to make extra money? 

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