ORAL se# ?????????????

if i and my bf do oral.. and only we both do it FOREVER.. (after married too).. we wont get STDS or any diseases rite? coz its only us.. does std or aids occur coz one person gets in contact with another's body fluid (even though he/she hasnt done any ual things or with anyone else be4).. or issit coz the person has has manyyyy times and done other things wif many girls.. and thats why when a girl kisses his prvt part.. she can get std?