Brothel client
“Puffgänger” is a colloquial, often pejorative term for people who seek sexual services in brothels or from sex workers. The term is not neutral and is generally used informally or disparagingly. In substance, it describes visiting a brothel or engaging with sex work in the context of consensual, paid sexual services.
When using the term, it should be noted that sex work is an area that is judged differently in legal and social terms depending on the country. Respectful and factual language is generally preferable. The key points are voluntary participation, legal frameworks, safer-sex practices, and protection of everyone involved from exploitation, coercion, or violence.