Cassio is a ladies’ man, that is to say, a man who feels most at home in feminine company where his looks and good manners make him popular, but is ill at ease in the company of his own sex because he is unsure of his own masculinity.
[…]
Cassio is a ladies’ man, not a seducer. With women of his own class, what he enjoys is socialized eroticism; he would be frightened of a serious personal passion. For physical sex he goes to prostitutes and when, unexpectedly, Bianca falls in love with him, like many of his kind, he behaves like a cad and brags of his conquest to others.

Author: W.H. Auden