Female protagonist porn games are generally difficult to make than Male protagonist. The challenge really boils down to one issue: male and female sexuality greatly differ from each others. Males have harems, females don't. Females are stuck with a child, males not. Male can have multiple of partners, females can't. Basically in FP games the MC either is a slut, is raped/groped/abused, or is lesbian. Even in f95zone it is difficult to find a porngame where FP acts like a male, for these kind of games generally are not very enjoyable. Simply to put it, there is no pokemon game where FP collects all dicks, there is very little demand for games where MC acts like a prostitute. MP is even not always depicted during the sex, but female is always. In this sense the FP game would be repeating the same girl constantly, and no matter how pretty she is the player will get tired of seeing her.
Simply to put it, when there is FP the genre has to be different. FP often are involved not in a physical adventure, but in a mystical, mind games, or social dilemmas. Rise of White Flower is a good example of FP that acts like a male, basically she is a highschool girl in a fantasy world. Then these is Sarah Rose must survive, where the FP is more traditional, but even then half of bedpartners are females. Claire's Quest has a bit of both, but in essence it is a abuse-mystery game. Even Desert Stalker follows these rules: Shani is down in a wonderland while her dad slays men and builds his harem. Her dad can suggest an elf to become his slave, but Shani won't do the same. If the themes were reversed the Desert Stalker would suck, it would not work other way around.
