درد و دل کردن

Mostly, yes. It implies 'dard' (pain). For happy news, you would use 'khosh-bash' or just 'gap zadan'.

Absolutely. It's a vital part of marital intimacy in Iran.

Venting is often one-way and aggressive. 'Dard-o-del' is softer, more mutual, and focuses on the 'heart' connection.

The phrase is neutral, but the act is informal. You can use it in a novel, but not in a legal document.

You can say: 'Dalam gerefte, mikhāham bāhat dard-o-del konam.'

Yes, though they might do it less frequently or in different settings than women.

Usually, it's a social act. For talking to yourself, you'd use 'bā khod harf zadan'.

Only with very close colleagues during a break. Never during a meeting.

Listen actively and use phrases like 'darket mikonam' (I understand you).

People sometimes just say 'درددل' (dard-e-del) as a noun.