Porneia is sexual behavior that is considered immoral by mainstream society. Examples might include having sex before marriage, intercourse with animals, ... some religions might consider gay or lesbian marriages invalid and thus a form of porneia.
Porneia is not allowed and is against the rules of the Jehovah's Witness religion. Even flirting is not allowed.
Porneia involves 'immoral use of the genitals, whether in a natural or in a perverted way'. This includes oral sex, anal sex, and manipulation of the genitals between individuals who are not married to each other. Porneia does not require skin contact, copulation, or sexual climax. (Iv p. 99; w06 7/15 pp. 29-30; w04 2/ 1 . wOO 11/1 p. 8 par. 6; w83 6/1 pp. 23-26) Sept 2010 publication for Elders, "Shepherd The Flock Of God." 1 Peter 5:2 p.59