I am kinda curious to like Honey about the age of your wife.
Did she mention this motherhood thing to you often? If so how did you respond. Was it not possible at all that you two could have started a family sooner then this? Or she is the type of person that has to have everything just right and planned out? I guess I wonder about this because when my husband and I decided we knew we had so much love to give this child we wanted. After all that is the most important thing. We also had a roof to put over it's head. But if we would have waited until every little thing was perfect maybe we would have never had children.
Also with the sexual aspect of things I may be wrong but I thought you mentioned that your wife and you would make love twice a week. Was she wanting more then this? Does she see desire differently like more kissing, hand holding, or compliments. I know you said the SSM is a big part of her hurt but was wondering how deep this ran?