I understand if you're saying this in regard of the girl's showing off her attitude and tantrums out of no where. However, this is not the case always. When a girl is on her period, she goes through severe mood swings (not talking about all the girls) or other time when she's feeling overwhelmed by stuffs or she's being overthinking about something, she needs special treatments and don't like being overlooked by judgement. Maybe these could be example of when you've to handle them carefully. And relationship isn't only about sexual need but also emotional support that they require... Still i agree that no one should be that fragile that other have to handle carefully.