I think you all are thinking waaaay too much the joke, is a joke about she being an airhead, nothing more and nothing less... Nothing to do with her sexualiaty
Everybody's talking about Nakiri, but no remarks about Tan-chan plowing ahead about Shiba-san like a panzer tank through Poland? She literally had me in stitches by the end of the chapter.
Sigh... So many Shiba-san in this comment. I think that Nakiri finding a wife joke is made vague on purpose. We still don't know yet which path she'll take, don't think too much about it now