Do I Have To Use Nofollow Attribute For All Outbound Links Of Curated Content?

During episode 96 of the weekly Hump Day Hangouts by Semantic Mastery, one viewer asked about using nofollow attribute for all outbound links of curated content.

The exact question was:

For all the outbound links on curated content, do we have to use nofollow attribute on all of them? Is it OK to do this for all the outbound links?

Thanks guys!