Is it weird to think ' The oly woman ill sleep with is my wife ' ?

I jus read a past question wich said a girl slept with her best friend . some1 posted ' we al sleep with our best friends ' . I cant believe it ., I mean im 18 .... kno evrythin a person needs to kno bout .... a lil induced i guess ( fyi .... i dont hav interests in nowadays ) . but i don wanna be sleepin around with any1 unless its my life partner ( don mind if its b4 or after marriage ) .... but oly one person for me . Is tht weird ?