Odds and Ends
11 2, 2:58pm
Since SATW humor relies on sweeping generalizations, making a joke with a minority case doesn't fits here. Male prostitution is marginal compared to female prostitution.
As for sexualization of women, it's men who determine whether women are sexually appealing or don't. With some exceptions, most men agree that women are sexually appealing. So this leaves potential communicators with a large sector of population which is both prone and sensitive to the sexualization of women, and that's a powerful incentive for said sexualization.
Also in the specific case of advertising, women are sensitive to role-leading women, thus women are used to sell certain products/services to women... that explains why women dominate visual advertising.