I'm not sure you want feedback or just people who agree with you. It sounds like you are using semantics to get around you mother. She does care that's why she keeps bring this up.

She didn't grow up with the web the way it is now. She does probably know that what's on the web is out there for good. It can always come back at a most inconvenient time. It does sound like you keep trying to justify you actions by saying it doesn't really count as sexual, most of the stuff isn't sexual. Kind of sounds like you are trying to justify it to yourself too. Have you talked to a T about this and all the possible ramifications that might happen in the future? Most places now run Internet searches before they hire. Then there is the IRS that has been brought up, and there are the crazys that will do anything to find you. These are just things for you to think about because it sounds like you did this on impulse without much research.

If you were in your own house or apartment I say fine go for it, but you are in your mother's house, she is upset about it. Just because she hasn't said the Magic word,no and hasn't out rightly forbidden it doesn't mean she's ok with it. Perhaps she would help you get your own place and once there you and your boyfriend would have to cover the expenses, you can make money anyway you want. Just know that as someone starting out you can't be that picking about where you live. It's got to be affordable that's all.