Afterglow refers to the lingering euphoria associated with orgasm. Afterglow can refer to both physical and mental effects post-orgasm.
More About Afterglow
The term afterglow was first used to explain the lingering effects of drug use, but it has come to refer more generally to a period of time during which a type of high or euphoria lingers after a climax or peak experience. In a sexual context, the term afterglow specifically refers to the period of time immediately following orgasm.