If you apply the analogy that marriage used to be a bad deal for women until some bits were changed by law, the same could be said of other things- such as the right to vote, and hence the system of democracy.
Until relatively recently, women weren't eligbile to vote- so do the anti- marriage brigade that believe that Parliament and democracy are wrong,- and therefore you don't vote- simply becasue women were denied the vote in the past?
I think what a lot of you are forgtting is that yes, there were elements of marriage that were very much weighted against women, BUT for many women it was a goal- you only have to read Jane Austen (Pride and Prejudice especially) or Hardy to discover why- because without marriage women were forced to stay in the family home, or work as governesses, or maids. Women had no real employment and marriage was the only way they could have any independence.
Now inthe 21st C women are more independent, and marriage for economic reasons is no longer a necessity- but overall men earn more than women and for many women they want the financial security of marriage as opposed to just being a "partner" with fewer rights.
I know that men are increasingly wary of marriage because they stand to lose a lot in the event of a divorce-the law has now favoured women so strongly in divorce that men are being left with few assests.
I know that high earning men of my son's generation ( early 20s) are now keen to have pre-nuptual agreements if they are ever possible, as they would give hem some protection in the event of divorce.
Having said all of that, most people marry for love. As I am a bit older than most MNs here, I think it is easy for the younger mums to be unaware of the stigma that was attached to "living in sin" as little as 20-30 years ago- and to the term "bastard" applied to children born out of wedlock. Certainly, my own parents were very embarrassed that I lived with my DH for 3 months before we married- it simply wasn't done in their generation.