The verse on lusting was given in the context of not committing adultery.
Matthew 5
27Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
28But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
29And if thy right eye offend thee, pluck it out, and cast
it from thee: for it is profitable for thee that one of thy members should perish, and not
that thy whole body should be cast into hell.
30And if thy right hand offend thee, cut it off, and cast
it from thee: for it is profitable for thee that one of thy members should perish, and not
that thy whole body should be cast into hell.
No married man or woman should be thinking about having any sort of sexual relations with anyone other than their spouse.[/QUOTE]
That was the point Jesus was making.