From Roberto Bolaño's 2666:

Sometimes Inspector Juan de Dios Martínez was surprised at how well Elvira Campos could fuck and how inexhaustible she was in bed. She fucks like someone on the brink of death, he thought. More than once he would've liked to tell her it wasn't necessary, she didn't need to work so hard, that just feeling her nearby, brushing against him, was enough, but when it came to sex the director was practical and businesslike. Darling, Juan de Dios Martínez would say to her sometimes, sweetheart, love, and in the darkness she would tell him to be quiet and then suck every last drop from him--of semen? of his soul? of the little life he felt, at the time, remained to him? They made love, at her express request, in semidarkness. A few times he was tempted to turn on the light and look at her, but he didn't, not wanting to upset her. Don't turn on the light, she said to him once, and it seemed to him Elvira Campos could read his mind.