Your points may be valid, however they have a male skew. Your arguments against women wanting monogamy consisted entirely of examples of why men are polygamists and the practices of men!
If Steemit wants to attract and empower women, the focus should be on what women want (empirically) not on what men theorise that that women want (based on our biases). I don't think the ability to upload porn is high on the list for women.