Also, the pill for women was the first product and therefore only had to be better than the alternative. A pill for men would be a substitute to the current one for women and would therefore have to show improvement over that. Investing several billion $ just to end up with a drug that has the same side effect taken by the other gender is not a wise investment. Yes, there's the topic of gender equality, but there are already other alternatives that come with less side effects (but are less convenient).
That's an excellent point. One possible improvement could be control by men of their own reproduction: ie, full contact sex without the possibility of conception if the male does not wish to conceive.
