heart on one's sleeve

"People want sincerity," she says while championing the cause of wearing one's heart on one's sleeve.

When trying to establish a relationship is it better to play hard to get or is it better to wear one’s heart on one’s sleeve?

Wearing one's heart on one's sleeve is good for one conversationally.

As for honor, I laugh at most of the things I believe in, just because it's the fashion of the day—and I belong to the day I live in—not to wear one's heart on one's sleeve.