If you are already in the relationship before you decide to, yes sir. You're totally right. If she didn't accept you with the steroids as a clause at that time, it's basically on her to say if she wants to stay with you if you make that change. That makes it super tricky when trying to bring it in after awhile. The longer you've been together gear free the harder it will probably be.
That's why I'm happy I started gear when I was single. Then, never let it go past a first date without getting it all on the table. I'm a broke ass felon, I smoke grass, I'm in constant custody battles with my kids mom, gym is life, I use performance enhancing substances, all the **** that causes that awkward silence when they find out two months down the road.
I stuck to my guns and now I have a fit, down-ass woman who both tokes and hits the gym, and is cool with my gear use and long, grueling gym sessions as she sees it as a part of me because if you don't lie about it then you're owning it. There were a number of dead ends, but this was worth the work. If I had to do it over, I wouldn't do it any other way except I would have adopted this mindset earlier on.