If a guy talks dirty and calls you strange things only during sex, then he's probably swept up in the moment of sexual frenzy and is going back to his roots (the same reason why some men and women growl during sex). Now if he talks 'dirty' while not having sex, that would be a problem for obvious reasons.
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Talking dirty typically involves using explicit or sexual language in a conversation. It could imply that the boy is trying to be flirtatious or express his attraction towards the girl in a more provocative manner. It's important to ensure that both parties are comfortable with this type of communication.