I mean, let's say this is your brain. OK, from what I know about you, your brain consists of two parts: the intellect, represented here, and the part obsessed with sex. Now, granted, you have extracted an astonishing amount from this little scrap. But with no-sex—Louise, this previously useless lump is now functioning for the first time in its existence.
Jerry explains that it's a lack of sex that has led to George's sudden apparent surge in intellect.