Maryland Divorce ~ Separation Without Cohabitation
It is still possible to file separation without cohabitation if your spouse wants a separation and you do not. Maryland requires two years of living apart. Whether the separation is voluntary or not it has to be continuous. This does not mean that you cannot be around your spouse, it means you cannot have sexual relations with one another. If you do end up in a sexual encounter with your spouse your waiting period must start all over again. It will begin the day after your last sexual encounter. Sex between you and your spouse is strictly forbidden during your waiting period. Sex with anyone outside the marriage could also change the scenario and the grounds for your divorce will change. Another rule here is to live in two completely separate places. This does not include different areas of the house, rather different addresses.
Source : How To Do Your Own Divorce In Maryland by Richard S. Granat (2004)