genitalia (n.)youdaoicibaDictYouDict
"the genital organs," 1876, Modern Latin, from Latin genitalia (membra), neuter plural of genitalis "genital, pertaining to generation or birth" (see genital). The Latin word also yielded, with change of suffix, French génitoires (12c.), hence Middle English and early Modern English genitors "genitals."
jock (n.)youdaoicibaDictYouDict
1952, short for jockstrap "supporter of the male genital organs," which also meant, in slang, "athletic male." Jock with the meaning "an athletic man" is from 1963, American English slang.
jockstrap (n.)youdaoicibaDictYouDict
also jock-strap, "supporter of the male genital organs, used in sports," 1897, with strap (n.) + jock slang for "penis" c. 1650-c. 1850, probably from Jock, the nickname for John, which was used generically for "common man" from c. 1500.
perineum (n.)youdaoicibaDictYouDict
"region of the body between the anus and the genital organs" (jocularly called a taint), early 15c., from Medieval Latin perinaeon, Late Latin perineum, from Greek perinaion, perinaios, from peri- "near" (see peri-) + inan "to carry off by evacuation," of unknown origin.