Heck, only three serious relationships by the time she is thirty is considered an accomplishment in some circles. Strangely, our oppression gives us certain freedoms. We can't get married, so no one really expects our partnerships to last a lifetime, not even us. When I meet a gay couple who has been together for a decade or more, I am impressed - much more so than I am by hets who celebrate their golden anniversary. That will change when dykes start uttering 'til death do us part' before the whole world.
Legalized marriage means increased expectations and increased accountability.
The days when you can dismiss your past loves with trite explanations like 'it just didn't work out' or 'we grew apart' will be over. Women will want to know what went wrong. There will be plenty of women out there looking for someone to share a final resting place with and they will not be enchanted with the prospect of wasting the best years of their lives with someone who can commit longer to a diet than to a woman. While you may now enjoy a lifestyle of free lezzie love, you'd better get it while you can because I suspect that having access to that 'little piece of paper' is going to deplete the number of women willing to roll in your sheets merely for the fun of it. I worry that there will be dykes who want to remain virgins until they marry.