From the latest Elders instruction book:
5. Por..nei'a:
(Lev. 20:10,13, 15, 16; Rom. 1:24, 26,27,32; 1 Cor. 6:9, 10) Por·nei'a involves immoral use of the genitals, whether in a natural or in a perverted
way, with lewd intent. There must have been another
party to the immorality-a human of either sex or
a beast. Willing participation incurs guilt and requires
judicial action. It is not a casual touching of
the sex organs but involves the manipulation of the
genitals. It includes oral sex, anal sex, and manipulation
of the genitals between individuals not married to each other.(lv p. 99; w06 7/15 pp. 29-30; w04 2/15
p. 13; w00 11/1 p. 8 par. 6; w83 6/1 pp. 23-26) Por-does not require skin-to-skin contact, copulation
(as in penetration), or sexual climax.
6. Self-abuse, or masturbation of oneself, is not por·nei' a.