What kind of girl of marriageable age doesn't know what a condom is, i mean yes it's an overused trope with the "pure" girl so pure she bleaches your eyes but it doesn't really fit this manga. Here the characters are a lot more "human" than the typical shonen character types.
Same trope repeating again and again... It's getting annoying and dumb.
They're playing tag, each time one of them finding problems where there isn't. Plus noah fucking over over it's just getting annoying after so many times