"Lust is not temptation but a yielding to it."
I don't want to start arguing at cross purposes because we're not defining terms in the same way.
When light bounces off a desirable woman and the photons impact the rod and cone cells on a man's retina, and are then converted to a biochemical signal and sent to the brain, a number of physical and psychological events occur. These can pretty much be expressed as, "Arrrrrgh, avast there me beauty; strike yer sails and stand by to be boarded."
That's lust.
"sexual desire as a degrading passion" is what I mean.