The game is definitely biased when it comes to sexual roles and even gender. Since the very beginning when the game came out you could tell Hyao's preferred POV was submissive male bottom. Most guest writers also are inclined to write this way. Even when playing as a female character and having a vagina you can see the game prioritizes anal sex and it's almost exactly as the bottom male dialogue. Plus many of Hyao's Patreons prefer bottom content. And it's really common with this type of games where romanceable characters are super masculine. They will give you the option to top but art and dialogue will always be better as a bottom.
The like and dislike system also plays against top players because many characters have this super macho man attitude and alpha male personality, obviously someone this dominant wouldn't bottom, and if they do they will not be happy about it because is more ''masculine'' giving dick than taking it. Sabal, Arion, any of the orc characters, the bandits and mercenaries, the lizards, the dwarfs, the soldiers, the werewolves, they all come from tribes, groups or spaces where you need to be strong and dominant so they will present themselves with big dick energy by default. While bottom characters don't present themselves like that. Scrap is the only wererat in the whole Junkyard that doesn't think about sex 24/7, Tao comes from a tribe of peaceful scholars, Everett hides that he's a bottom and you need to catch him first while Booner is fucking him to unlock more dialogue about it, even BLogan needs to get gangraped by bandits to break that 'tough guy' personality. Also look at the male/female character ratio.
I have played as a top, a bottom, a woman and the faithful Logan route, now I only have bottom. If you top enemies they hate you, if you defeat them in battle by just fighting without seducing them they hate you, playing as a female character is basically the exact same as a bottom except one or two characters will be more inclined to fuck you but you would't be able to top anyone ever. And the fact that the game has so many story branches doesn't help much either.
Edit. Forgot to mention that guest characters also tent to be tops in their original games so they will most likely mantain their role.