On the face of it, marriage between Touchstone and Audrey seems like a strange idea, to say the least. Apart from the enormous gulf in intelligence between the crafty fool and the ignorant peasant girl, there's the little matter of their decidedly earthy attitudes towards love and lust. One would've thought that Touchstone and Audrey would be better off satisfying their carnal desires outside the confines of traditional marriage.
Yet despite this, Touchstone still feels somewhat uneasy about "living in bawdry" as he puts it. He seems unaccountably attached to the prevailing social convention, which frowns upon sex outside marriage. His reasons for getting hitched to Audrey aren't conventional, to be sure—there's no real love or social advantage involved—but at least he and his intended will be able to present a more respectable facade to the world than they currently do. And for Touchstone, that's important.