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Yes, that’s right: I will continue to shamelessly reuse the joke in the title until I’m done trying to answer the question.
In Being and Nothingness, Sartre lays out a significantly darker conception of love than Aristophanes. For him, persons are forever torn between the “facticity” of their existence (that is, the factual presence and character of objects and phenomena in the material world) and the infinite freedom and nothingness of consciousness. Because this freedom is profoundly disturbing to us, we run away from it and impose limitations on ourselves, most notably by identifying ourselves with “the look” of others—the look being our own perception of their perception of us.
We can also direct the look towards others, and this is potentially an act of violence because it imposes definition on them and constrains their freedom. It draws them away from their consciousness into “flesh,” the medium by which they experience pure facticity.
So for Sartre, love and sex are just another way of acting out this struggle. Love is a way of diminishing the anguish of our internal struggle by identifying ourselves with the look of another who ostensibly “loves” us, while also directing our own look at that person in an attempt to enslave her and assert dominance.
In sex, one does this by causing such intense pleasure that it draws the other unbearably close to the flesh. And in both sex and love in general, the impulse one feels at any given moment is either inherently sadistic or inherently masochistic; one either wishes to dominate the other or be dominated.
I suspect there’s an inkling of truth in Sartre’s argument for the nothingness of consciousness, but the rest of this argument leaves me cold. For one thing, it admits no room for human empathy; everything is a power struggle. And even if you buy into such a relentlessly dark view of human nature, you have to deal with Sartre’s assertion that sex is purely about this power struggle—that there isn’t even a biological motivation. (No, really. He says that.)
Fortunately, Beauvoir is around to save the existentialist notion of love from Sartre.