How could I get a my future girlfriend/wife to agree to do this?

When I meet a woman I thought about after I get married I want us to have sex at least twice a week, maybe on Friday night and again Saturday morning. After we make love in the morning we could both nap for a couple of minutes. We could even make love 3 times a week and have sex on Saturday night too. I know sex isn't all there is to a relationship but I want me and my girlfriend/wife to have an excellent sex life.