It's different when you care, because it is love, and therefore more than physical. Some might argue that the dichotomy between love and sex is oversimplifying and incorrect. It's not that simple either because love goes places that sex can't, yet love can be enhanced in it's sexual expression. The tension, the bond, the desire between two lovers can nourish love as much as it can smother love. Sometime there is a split between love and sex. Sex can be an expression of love, of lust, of desire, of hormones, of the instinct to procreate. The physical offers a connection for love, but it is only a catalyst, a fertile ground, and never a source. Love is transcendent, it is commitment, it is something that psychology cannot contain. We feel things like love, and even call it love, but love is more than what you might feel for a prom date. For some the merely physical is easy until it becomes complicated by love whle for others the physical is complicated until there is love.
This needs a bit of sorting and will be revisited after I've had some sleep.
Love, I suspect is in, or is, the energy two people create between themselves. It is an expression of something universal to humanity, to every human being, but it is unique each relationships expression. Love is never built on pathology.

I've sorted it a bit but I feel like this post will continually edited.