Etymology of the Swedish word sex

Cognates

Dutch zes, Dutch seks, English sex, English six, French sexe, French six, German sechs, German Sex, Icelandic sex, Italian sesso, Italian sei, Latin sex, Latin sexus, Lithuanian šeši, Norwegian sex, Polish szes, Portuguese seis, Provençal seis, Russian шесть, Spanish seis, Spanish sexo, Yiddish zeks