This is simple. We all forget to do it. We all need to do it.
Kiss your husband. Kiss him like you kissed him when you were dating. Kiss him in a way that embarrasses your kids just a little bit.
If you stop him the minute he walks in the door from work and kiss the lips off of him, rather than engage in the usual parent to parent update/question/answer period things will be better. Guaranteed.
It's good to be nice to strangers in parking lots, polite to the mail man, friendly to the Starbucks Barista. It's more important to be nice to your hubby. Love on him, take some initiative!