My DH's ph was 9, too and it was suggested he see his doctor as a ph that high can be indicative of infection. He got checked out and sure enough had a prostate infection. I would suggest you get him to contact his doctor to make sure he's okay...otherwise, nothing you do will affect his ph...plus, I read recently that antibiotics actually sway girl :)
To lower ph for both of you, you can take cranberry caps, but I would make sure he was okay first.
Good luck!! :)