You didn't say how long he was in rehab (or I missed it).
The biggest thing that helped in my journey, and also helped our marriage, is simply set aside time every day to be alone together. If there are children in the home, this could be difficult. Time alone to talk, for intimacy or simply to be in each others presence. This was a big help in not only my sobriety but our relationship, and we both came to look forward to that time spend together.
I'll throw this out there as a caution: His hormones/body chemistry will be out of wack for some time. He may crave sex like a dog in heat, he may feel nothing or just feel "flat." Give it time to even it out. This almost became an issue between my wife and I!