Do it be like that tho ? Its relatively easy to guess if an anime will probably have underage sexualization and fanservice based on cover art , a trailer and reading the description/genre. Its rarely a huge surprise or totally unexpected when it happens for a specific show

Also just watch more movies ,classics, anime with adult casts and of particular genres you enjoy in other media instead of picking up totally random seasonals hoping to strike gold. There are hundreds of anime without underage sexualization and with high quality animation, directing and storytelling .Its not that hard to find a few