Is it fair to infer from your statement that all sexual contact between a husband and a wife, except that which immediately precedes intercourse, is similarly immoral?
As far as I know, any and all contact is moral and licit, provided that the sexual act itself is not "closed to the possibility of life". Because that's what it's for.
A cruder way of stating it is this: whatever you do, just make sure you are at the line of scrimmage when the ball is snapped.