So it's just that the smaller the amount by which males are sexually dimorphic over females, the more monogamous they are? Are there any completely monogamous primate species where the male still has the sexual dimorphism advantage over the female?

I was wondering what sort of behavior is favored when sexual dimorphism leans towards physically dominant females. Is that what happens with bonobos?

What is the degree of sexual dimorphism in chimps? Their behavior is very interesting.