Some of each, but mostly slip on. How is it significant?

Someone did a study years ago - I'm thinking as far back as twenty years - comparing men who wore shoes that tied vs. shoes that slipped on. Results of study showed that tied shoe wearers were much more conservative and sexually repressed where their sex life was concerned, than were slip on shoe wearers.

Since then I can't help but check out guy's shoes and silently wonder...lol