Since the sex of the speaker is normally as obvious as can be, there is no point in coding first-person singular gender – or so it may seem. This typological study examines the extent of sex-based gender marking in personal pronouns, possessive determiners, predicative adjectives, and verbs across first-, second-, and third-person singular. A worldwide perusal of grammars in addition to data elicitation yields a total of 115 languages with first-person gender. The paradigms of pronouns and possessives are found to be highly inconsistent, whereas those of verbs show a tendency towards consistency. Gender marking on adjectives is fully consistent. The likelihood of first-person gender is increased by a general sensitivity to gender and a dedicated gender morpheme. A distinction is made between pronouns and possessives as referential units and gender markers on verbs and adjectives as grammatical units. By their very nature, referential markers are sensitive to the contingencies of the extralinguistic world and subject to communicative constraints such as redundancy and economy. They therefore end up being organized in inconsistent paradigms. By contrast, grammatical units are largely untouched by these extraneous influences and may therefore develop consistent paradigms.