There is only one thing that I do not discuss with my wife, ever. Motorcycles. She does not understand them or my attraction to them. She does not "approve" of them.
If I waited for her to give me permission to buy a motorcycle, then it would never happen, I would never get to have one. Years ago, when I bought another new bike, (not a collection, I own just one at a time), she came unglued and said I had to get rid of it. I explained that this is not a battle she would win so she should choose not to fight it. I explained further that if this one thing made her so angry that she wanted to leave me that it was a problem she had and I did not have and that she should leave. End of discussion. I buy a new bike every year. Anything I want. I bring it home. There is no 'why" discussion. She will sometimes ask me about the bike but there is no longer a question of "why".
I don't own motorcycles to spite her. I own them because I love them and they make me feel good and I enjoy riding them. There is no seperating me from them so she had to make a "package" choice. "Me and motorcycles" or no "Me".
Been married 31 years this coming January. Owned motorcycles for 31 of those years.