Women should also be able to vote on laws that only apply to men (such as whether or not to go to war), non-immigrants should be able to vote on immigration law, ETC. Equality means that we all share equal power in the decision making regardless of whether the outcome effects us.
Actually, I misunderstood the question a bit. I assumed the topic was laws that "affect" only women. I suppose there are laws that apply only to men but affect women as well and likewise.
Irregardless, though, I'm curious if there's an example of an actual law that applies only to women?
I wonder if the "equal protections clause" would then justify similar measures for other classes like children and the menatlly handicapped.