Use taboo in a sentence

Taboo is an adjective meaning prohibited or against etiquette. It can be used in any of the following sentences:

Drinking alcohol is taboo for many cultures.

It is taboo to talk about sewage at a tea party.

It is also a noun, meaning something which is prohibited or against etiquette. In this definition, it can be used in any of the following sentences:

In polite conversation, the biggest taboo is sexual matters.

In comedy, abortion may be the only taboo left.