What are the differences between Desdemona, Emilia and Bianca in their ideas about men and their relationships with their lovers?

Emilia is a very strong willed woman, and while she was
willing to get involved with her husband's machinations to a point in order to please
him, when she saw the completely terrible things he had done, she was willing to call
him out on it publicly, even when he was threatening to kill her.  Emilia is cynical and
worldly and is distrustful at best of her husband.

On the
other hand, Desdemona is so in love with her husband, she's willing to take whatever he
dishes out to her, no matter how much it hurts or humiliates her.  She loves him to the
point of complete blindness that it is often inferred that she doesn't struggle too much
when he kills her.  If you want to see a truly heart breaking rendition of this, rent
the 1995 movie version of Othello.

Bianca is a courtesan,
which is sort of similiar to a prostitute so she sees most men accordingly, though she
has a soft spot for Cassio.  She allows Cassio to repeatedly tease her with the promise
of marriage, though she should know better.