Take for example penalizing the partner who is cheating in divorce settlements, this is something I know no Slovenian court will ever take into consideration but something people who actually want a traditional marriage would love. In general maybe some people would like to make divorces more difficult because they in general don't mode approve of them. Maybe some people think default custody should de facto lie with the husband instead of the wife (as it does currently). ect. ect.

Careful, you need to weaken the political power of feminism first, otherwise they will try to pass restrictions on the types of marriage contracts to be enforced, similar to the restrictions on employment contracts.