As far as I know, a lot of women enjoy sexual activities more while menstruating. It might have to do with blood flow to the area and it helps with cramps. My current partner similar to your H does not want to do anything while I'm on it, but that's just personal preference, it's not that nobody does it or enjoys it. As others have suggested, maybe there's a middle way like him using toys or something? And else, I think it's perfectly fine to declare the week a "no sexual activities besides masturbating on your own" time unless you feel like offering something to him. But you already have to deal with the whole thing once a month, he can survive a week by himself.