I think that if sex-havings or sex-wantings don't come into the picture you're not really talking about manliness. You can be strong like a lion, you can be wily like a fox, you can be pretty as a picture, but I don't think any of those make you manly unless you have to deal with sexings. For that reason, I don't think that either Superman or Wonder Woman (for the most part) qualify as either manly or unmanly.
For referential purposes:
Specifically the quote, "What makes a man, is it the woman in his arms just 'cause she has big titties? Or is it the way he fights every day? No, it's probably the titties." And while I think the same can be said for a man having a man in his arms with a generous bait and tackle as well, the point stands that it's not just being tough or determined or good.