Aaron pegged it. Your husband will need to feel safe, and that might be harder than you think. If someone who he felt could be trusted betrayed that trust and abused him, then ironically enough, someone he feels he can trust now is likely to seem dangerous. No, it doesn't make sense. Yes, it happens to me.
If you can get your husband to surf through here and just read what we have written to and for one another, he may begin to feel less isolated in the experience. It's very hard for a man to consider discussing having been sexually abused, partly because each of us fears that we're the only one, or we're overreacting, or we were too horribly shamed, or.... Once he can see the discussions here, it may be easier for him to get past that part. He can visit and read here anonymously. I know, 'cause I did for months.
With all that said, I need to tell you that you can't make him do anything. Tell him you know that we're here, tell him he can see us and we won't see him unless he makes himself visible (registers and posts). Probably the most you can do is print some of what you see and let him read it without even having to visit here himself.
Take care of yourself, and keep posting if you need to vent, ask questions, etc. There are a lot of beautiful people here helping each other every day.
"Telemachos, your guest is no discredit to you. I wasted no time in stringing the bow, and I did not miss the mark. My strength is yet unbroken…"—The Odyssey, translated by W.H.D. Rouse