Why deshou in casual speech?


I often see "deshou" instead of "darou" in text where only plain, casual verbs
are being used, that is, a converstation between friends, for example. Why is
that? Why not darou?




In casual conversation (i.e. even when only plain, casual verbs are being
used), women/girls (and young children too) tend to use 「でしょ」「でしょう」「でしょー」 etc.
instead of 「だろう」「だろ」 at the end of sentences. 「だろ(う)。」 sounds more masculine
and 「でしょ(う)。」 sounds more feminine and softer in casual conversation.

