Could you define what "tachi" means?
But yeah, sexual objectification and sexual assault is very common. The bigger issue I find is that female characters in these games don't get to choose when/why they get to have sex. They are forced to go into a place to get some mcguffin where they get assaulted, or a guy has some sort of magical power or higher political/magical goal that makes women have to have sex with him. Women in these games are never allowed to go about and choose who they have sex with and are portrayed as never actually wanting sex to start with, just for the sake of having sex. If they do it's always because of prostitution or some other goal that the player character forces the heroine into.