Lust and attraction are like the booster rockets that help get the space shuttle out of the earth's atmosphere. Once it's out, they're jettisoned. They burned hot and strong enough to accomplish one specific task...but they burned up all the fuel so what remained really wasn't useful anymore.
Attraction and "lust" are the same way I think. It's strong enough to get you together, but it fades and new feelings develop that bind you together even closer but it only happens as you meet each other's needs outside of the bedroom (as well as in) over time.
In relationships, I'd be willing to be that the couples who remain "in love" for their entire M (I've never met any, though) do so because they learned to meet each other's needs.
There's no such thing as magic...only a belief in magic.
Incidentally, I haven't met one couple who have been married any decent length of time that didn't confess, at some point, their spouse could have been a wooden indian for all they felt.
You keep using that word. I do not think it means what you think it means. -- Inigo Montoya, 'The Princess Bride'
