Almost every couple that I know that have either ended or continued that introduced kids further down the line has seen both signficant physical and mental changes due to the fact that kids were brought into the relationship. This one couple I know whom was happily... and i mean really happily married for over 8 years decided to have kids one day.. and damn you could just see the changes in the love and affection they had for each other. They no longer have as much time for dates, working out together or simple shyt like sex. Then you have situations where women will without notice chose loving the children over there own spouse. Kids can without a doubt be a huge detriment to most relationships