RELATIONSHIP PAST HISTORY???

JUST LIKE A USED CAR WE GET CAR FAX, SHOULD WE DO THIS IN A NEW RELATIONSHIP? THE CHANCES OF U FINDING SOMEONE BRAND NEW UN TOUCHED IS 1 OUT OF 1 MILLION. SO SHOULD U CHECK THE MILEIAGE? WEAR AND TEAR?? OR SHOULD U JUST JUMP IN IT AND GO!!!! WITH NO WORRIES ABOUT THE PAST HISTORY?? THIS IS TUFF