I agree- there is no reason why either sex can't sing any song, but it can lead to some strange and irksome misperceptions.

I remember a recording that a Mudcatter did in which she sang a song she had written from the perspective of a friend of hers, a friend who was marvelling at how beautifully his almost-grown daughter had turned out even though he had missed many of her growing up years. It was very clearly written from a "daddy's" viewpoint.

After hearing the tape, an acquaintance of the Mudcatter said to her, "I didn't know you have a daughter." He was serious.