Should couples exchange passwords?

[Anonymous]

Is it common for people who are in a relationship to share passwords of their phone, email account, social media accounts etc.?

Is it a must in order to be in a healthy relationship?

I recently read through a relationship quiz and found one of the questions to be:
Would you trust each other with your social media passwords?

It says that it is a yes for healthy relationships.

I am single my whole life. If I happen to be in a relationship in the future, I might feel uncomfortable to share my password with my partner though.

What are your opinions about this?