I don't know of a single instance of a homeschool family where the father was "for" homeschooling and the mother was "against." In most cases, the mother is the one who does the research and prepares the case for the father as to why she should homeschool. It's generally the mother who convinces the father.
I've offered advice to several women (hey even some Freeper women) on the male perspective and key points that men will be interested in when discussing the homeschool option. Here are some highlights:
1. Gather the latest statistics on the achievements of homeschoolers. Facts will help your argument. Emotionalism will not. Comparison of achievement test scores is a good place to start.
2. Emphasize that you want to "educate our child at home," not that you want to "keep my babies with me." The first implies that you're taking an active stance on advancing the child's interests. The second means that you want your children to never grow up.
3. If all else fails, just start doing it. Nobody ever said you couldn't do some homeschool activities while your children are still enrolled in public school, or even before. Heck, my wife taught my son to read at age three (he wanted to read his own stories... this was not a forced thing). After that, I knew she was capable of teaching him.
4. Address how your child will have the opportunity to grow friendships outside of the schoolhouse. I didn't want my son to grow up a hermit. I wanted him to have a chance to play sports if he wanted. My wife showed me that she was concerned about these things, too, and she had a plan.
5. If you work, what is the economic impact to the family if you stay home? Have a prospective budget worked up.
6. Ask your husband to go to a local homeschool support meeting or event. Just knowing that there are regular guys with regular kids who homeschool is an eye-opener.