I am trying to remember a book with a female explorer who I think was the captain of an expedition to an alien planet. There, while exploring some alien ruins, she comes across a weird looking pitcher plant that, unbeknownst to her, emits strong sexual pheromones in order to attract prey.
Being seduced by the plant, she falls in its trap thinking she's having incredible sex. Luckily, another member of the team, who was immune for some reason (cold? allergies? mask?) rescues her just in time before she's consumed by the plant.
Despite the hentai-like scene, the rest of the story was quite serious, bordering on sombre actually. It was probably part of a longer series of books written in English from the early 2000s.