Kalmar "autosexing" tana nufin tsarin gano jinsin kaji, musamman kaji, bisa halaye na zahiri da ake iya gani yayin ƙyanƙyashe. Ana amfani da wannan tsari sau da yawa wajen noman kaji na kasuwanci don raba kajin maza da mata da sauri don kiwo ko kiwo daban-daban. A cikin nau'ikan yin jima'i, ana iya amfani da wasu halaye na zahiri kamar launin gashin tsuntsu, alamomi, ko alamu don bambance tsakanin kajin maza da mata.