A man and woman are seen having sex in the opening of 'Death on the Nile' (2004)

A few episodes deal with 'adult' topics like characters having an affair or being accused of such.

A brief sex scene in 'The Hollow' (2004)

An artist's model is shown fully nude in 'Four and Twenty Blackbirds' (1989)

The profanity is milder in the earlier years (seasons 1-8; 1989 - 2002). The profanity in the latter years (seasons 9-13; 2003 - 13) can be quite harsh.

"Shit" is used in 'Taken at the flood' (2006).

'Lord' 'God' "For God's sake" and 'Bloody' aren't used much but they are the most frequently used words overall.

'Goddamn' and 'Bastard' are used rarely.

Poirot occasionally smokes cigarettes, also some people smoke casually pipes and cigars. There is casual drinking , and some people get drunk occasionally.

The later episodes tend to be darker and/or more violent.

"The Tragedy at Marsdon Manor" "The Adventure of the Egyptian Tomb" and "Dead man's mirror" can be seen as three of the spookier 1990's episodes.