(I really just came here to compliment your hilarious icon)
In that he also states his favorite occupation is "Glancing at Netchen" - his cousin. If you use that source to call Marx sexist, you should be obliged to call him incestuous as well. Or we could acknowledge that all such 'confessions' were tongue-in-cheek and not meant to be taken literally. From the page you linked: ""Confessions†were semi-jocular questionaires that were very popular in Victorian England, and filling them out a common passtime in many families, including Marx's, where friends and relatives particpated. A number of versions of Confessions belonging to Marx have been preserved."