Censored spelling of セックス (sekkusu, “sex”).

(literary) they

sex, sexual intercourse

to have sex

room (of a house or hotel), chamber, apartment, flat / (sumo) a stable where rikishi live and train together under a shisho oyakata (stable master)

to return / to go back / to come back

go against, run counter to / go back, return

return / go back / come back / turn back

return

anal sex