Jannis,
If you have this need you must decide what is driving it and be honest with yourself before your discuss it with your wife . You need to give her a sensible explanation why you you have this need . Also what your needs will be in the future , just telling her I need or want to do it isn't enough .
I can only say from my experience that it was a gradual process in finding ME .
Perhaps you should also consider if she totally applies the brakes what you will do ? My wife did concede in letting me attend a social group but I'm afraid it still wasn't enough . Once on this road U turns become harder so think hard before pushing the envelope further .