What is 'bog orgy' in French?

Partouze [or orgie] au marais is a French equivalent of 'bog orgy'. The feminine nouns 'partouze' and 'orgie' mean 'orgy' in respectively familiar and more formal ways. The Word 'au' combines the preposition 'Ã?' and the masculine definite article 'le' to mean 'to the'. The masculine noun 'marais' means 'bog, marsh, swamp'. All together, they're pronounced 'pahr-too-zoh mah-reh' and 'ohr-zhee oh mah-reh'.