Can you make a button in settings that will hide every : yaoi yuri harem novel. Thats would be heplfull when you gonna give something for children to read.
No harem function in app settings?
Kopie I don't think there are any feature like that.
Don't forget there are also r@pe, @dult, and some other more offensive stuff compared to those you have mentioned.
Or you can just check the guidance of the novel in the information page. (it would be at the very bottom of the page)