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Steam-Heart's (スチームハーツ) is a PC-98 shooting game by Giga ported to the Sega Saturn in 1998 in Japan. It is a vertically scrolling shooter with hentai scenes interspersed related to the game's story; the Saturn port tones downs or removes the sex scenes outright.
In the game, you play as a team of anthropomorphic fighters who must use their male leader's semen to cure the female guardians of their land, who have gone insane due to some infection, and have to cut through the swarm of defenses leading to each guardian in the shooting section.