I think our partner isn't allowed to access our email or social media account because we need our privacy, we must have the media that we able arrange by our self. For me, my email is for my bussiness, so i think it just for me and nobody can't intervention that. If your partner can acess that, i'm afraid if he/she doing something wrong (delete some folders, etc) it can harm your job. And then social media it's very private and its a place which you can do 'me time' (like post whatever you want, stalking someone/ artist, etc). If your partner intervention it, what you post is his/her will, so no privacy anymore.
The best thing in the relationship that each partner still have a privacy in their life, because if no privacy the relationship will be boring. In the relationship we must have honest and trust, so no problem if we have privacy in our email or social media