oral sex; fellatio; cunnilingus
A clinical or formal term for oral sex, encompassing both fellatio and cunnilingus. Not typically used in casual conversation; more common in medical or explicit contexts.
Sexually transmitted infections can also be transmitted through oral sex.
この法律では、口淫もわいせつ行為に含まれると解釈されている。
Under this law, oral sex is interpreted as being included in obscene acts.
Sino-Japanese compound: 口 (mouth) + 淫 (lewdness, obscenity). The term is a formal coinage, likely from medical or legal terminology.