Am I in the wrong here? a bdsm related question?

I'm 20, and my mom was using my tablet, than got curious and looked through my crap, she saw something she didn't like, and then proceeded to yell at me about it, and called me a slut, tart whore all these other rude names. I told her calmly that is was MY business, and MY business alone, and than reminded her that she was in no position to lecture me about sexual behavior, really she isn't because she had two affairs, and sent pictures to all these guys; basically I am in an online bdsm relationship, with a guy who's 43 years old, we're getting kind of serious, we're soon going to have a introductory date, basically nothing sexual, just meet up, discuss in person, limits and what not. I intend on taking this matter seriously as well as safely, and I'm not doing anything sexual with him until at the minimum the third date. I mean it's not all about sex for me, I really like the guy, I feel somewhat, happy with him, and he actually cares about my feelings, and well being, and he listens to me even when I talk about silly things; I guess I can say he gives me something I never really gotten from family. It may seem strange, or almost perverted in way yes, because of the drastic age difference, but yeah.