public display of affection 公开示爱；公开表示亲昵；公众示爱；撒狗粮

【例句】
Public display of affection is a common thing nowadays.
如今，在公共场合示爱是一件很平常的事情。

Since I am not the president of university, I don't want to say|that there should be a limit|on public display of affection.
我不是校长，我不想说在公共场合表达爱意应该受到限制。