If you're asking me "Is it anti-DB to ML with your spouse when they are in walkaway mode?", then the answer is "No, it's not." MWD even wrote an article on this, and she's generally in favor of keeping up the sexual connection as a way to remain close and build intimacy.
I'm not so sure, but it's an intensely personal decision -- like the whether-or-not-to-wear-the-wedding-ring one, and I would never try to tell someone else what to do.
The best advice I've seen on here on the subject falls along the lines of "How does it make YOU feel, afterward?" "Are you able to stay detached, and continue your stated strategies and tactics if you ML with your husband, or does it tend to always throw you off your game?" "Do you feel used and like a doormat when you do, or are you able to enjoy it and take an "Oh, it's just sex -- have some fun!" attitude about it?"
Hope that helps. My only advice would be FOR GOD'S SAKES, USE PROTECTION if you do.
