Here's Schlafly on marital rape, but it's really Schlafly's view of marriage (via Feministing).
Could you clarify some of the statements that you made in Maine last year about martial rape? I think that when you get married you have consented to sex. That's
what marriage is all about, I don't know if maybe these girls missed sex ed. That doesn't mean the husband can beat you up, we have plenty of laws against assault and battery. If there is any violence or mistreatment that can be dealt with by criminal prosecution, by divorce or in various ways. When it gets down to calling it rape though, it isn't rape, it's a he said-she said where it's just too easy to lie about it.
From Schlafly's point of view, "[t]hat's what marriage is all about" for women, being available for sex when they want it and when they don't want it. Husbands can legitimately force wives to have sex when they have headaches, when they're depressed, when they're thinking about something else, or when they've just given birth to babies. Marriage means that women have pre-consented to sex at any time at their husbands discretion.
It also means that women have pre-consented to being forced to have sex as long as that force doesn't result in bruises, cuts, bleeding, or other visible bodily damage that could be seen as evidence of "assault and battery."
As long as there's no visible evidence, Schlafly assumes that it's a "he said/she said" and that "she" is a lying feminist.
Unsurprisingly, Schlafly notes that feminists (and millions of othe women) find this kind of marriage to be a "dreary" prospect.