Many religions, not just the WT, strongly condemn pornography. And this is just one example of a "brother" who saw fit to have his wife on hand to be sure he didn't feed his little addiction.
Yes, it's one more example of control, but I'm not inclined to make too big a deal about it. And let's face it, a lot of women, religious or not, do not want their significant other to be checking out porn.