So... is Dokyuu Hentai HxEros finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 26, 2020
Manga finished: February 04, 2021
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Earth is under attack by aliens called Kiseichuu, whose goal is to drain humanity's sexual energy and cause its extinction.
To combat this threat, a special weapon called HxEros was created, powered by erotic energy.
Retto Enjou, fueled by his hatred of the Kiseichuu, joins a team of HxEros users.
The team must maintain their libido to effectively fight the aliens and save humanity, which proves easier said than done, especially for Retto, who lives with a group of very stimulating girls.