Have you asked her why? Why she doesn't want to have sex like she used to?
I think Dom could be right because the first thing i was thinking when i read your post was "she got the ring and got to stop dealing with the sex."
it's not like you have some crazy insatiable need to have sex twice a day or anything (not that there is anything wrong w/ that) so if she's not willing to give in a little now and you guys just got M. Think about how much worse it could get if you have kids and life gets busier...
neither one of you are happy with this... anull and start over again later with someone else.
If i can't fall in love... I'd like to fall in chocolate! ~ Author Unknown