by lust, i am assumign that you are referring to " intense and unbridled sexual desire." if that desire were to continue to remain strong, even after experiencing the joy that comes from the satisfaction of that desire, then the question you've raised 's a hard one to answer... i think that under the stated assumptions, it boils down to whether one prefers lust or love. eternal love or eternal carnal lust? i would be inclined towards love because it touches you at a deeper level than mere carnal desire. love transcends the carnal and touches the spiritual and mental (lust does hte mental thing too, but only to a limited degree)....so it's deeper, and given that, my choice weould be the same as yours. for instance, i've seen dogs having sex in the streets. i lookded at hte dog's eyes, and they were glazed...it was like he was not there....it was like something else was possessing this animal...maybe the invisble hand of evolution was controlling this animal to engage in the act...it was fornication, not making love...this is probably an over-dramatic extension, but i think lust reduces us to that similar state of being, where we allow the primate in us to become controlled by the laws of evolution...that our function is simply to y preserve our lineage.....but we humans are beyond that.