Roman, adj. — Green’s Dictionary of Slang

Roman adj.

[in the taxonomy of international sexual stereotypes, Rome is identified with orgies]

in the world of gay sex, used to describe group sex.

1972		B. Rodgers Queens’ Vernacular.
2004		Guardian G2 27 Sept. 16/3: His band of ‘frottagists’, ‘Roman-shower enthusiasts’, ‘Funchists’, ‘tromboners’ and ‘upper-deckers.’.

In compounds

Roman culture (n.) (also Roman arts, Roman history)

orgies, group sex.

1966		Trimble 5000 Adult Sex Words and Phrases 177: roman culture or roman history (Sl.) Orgiasm or pertaining to a Orgy or Orgies.
1972		R.A. Wilson Playboy’s Book of Forbidden Words 98: ‘Interested in English, French and Roman culture’ signifies a desire to participate in sadism, bondage, oral sex and orgies.
1987		personal ad, adult bookstore Murray & Murrell Lang. Sadomasochism (1989) 116: Stuffy CPA wishes to be instructed in the roman arts.
1987		interview in Murray & Murrell Lang. Sadomasochism (1989) 116: Roman cultur is the one most often talked about but least often practiced.

Roman engagement (n.)

(gay) anal intercourse with a virgin woman.

1972		B. Rodgers Queens’ Vernacular.
1986–7		Maledicta IX 60: Roman engagement n [R] Anal intercourse with a virgin girl; homosexual slang.

Roman historian (n.)

(gay) an enthusiast of orgies.

1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular.
1986–7		Maledicta IX 60: Roman historian n [R] Orgy enthusiast; homosexual slang.

Roman night (n.)

(gay) an orgy.

1972		B. Rodgers Queens’ Vernacular.
1986–7		Maledicta IX 60: Roman night n [R] Orgy; homosexual slang.

Roman shower (n.)

(US) vomiting used as part of sexual relations.

2009

Las Vegas Weekly 8 Jan. 🌐 Porn Glossary [...] Roman Showers -- Vomiting on partner, usually after drinking urine or wine.

SE in slang uses, pertaining to Catholicisim

In compounds

Roman collar (n.) [SE Roman collar, a priest’s white collar]

(Irish) a generous head on a glass of stout.

1966

P. Boyle At Night All Cats are Grey 62: We all sat watching Jonty put the Roman collars on the pints with a few skites of fresh porter from the barrel.

Roman roulette (n.)

contraception using no other system than the notoriously hit-and-miss ‘rhythm method’ as ordained by conservative popes.

1969		M. Powell Climbing the Stairs in DSUE (1984).
1995		‘Natural Family Planning in the 1990s’ Lancet Vol. 346, 22 Jul. 🌐 To the lay person, natural family planning (NFP) equates with the ‘rhythm method’ or ‘Roman roulette’ and therefore tends to be considered as mostly a matter of chance, resulting in unplanned pregnancies and large families.