Thesaurus <span class="searchmatch">性交</span><span class="searchmatch">する</span> (formal) <span class="searchmatch">性交</span>(せいこう)<span class="searchmatch">する</span> (seikō suru): to have sexual intercourse (formal) 肉体関係(にくたいかんけい)を持(も)つ (nikutai kankei o motsu): to have fleshly relations...