The given term "heteros" seems to be a combination of the word "hetero" which refers to heterosexual or people who are attracted to members of the opposite sex, and the suffix "-os," typically used in Latin-based terms to signify plurality. However, I could not find any specific porn video tag that matches this term exactly. It might be a misspelling or a slang term from a certain language. In English, for heterosexual content, the common tags are "straight" or "hetero."