The only reason Father is remotely interested in marriage is because the Bible makes such a big deal of it. Nathan, as a person, isn't interested in sex or marriage at all. (Plus, isn't college where you go to get your MRS degree?)

As a young teenager, Leah totally buys into her father's idea that women are pretty much worthless if they're not married. With that in mind, her "skills" don't include anything useful like hunting or intelligence. Instead, they include embroidery, which she isn't even very good at.