ðɪs stɹˈiːk ʌv ɹˈɛd ɪz bɹˈaɪɾɚɹ ɪn mˈeɪlz ðɐn fˈiːmeɪlz, wˈɪtʃ, ɐlˈɔŋ wɪð bˈɑːdi ʃˈeɪp ænd ðə slˈaɪtli lˈɑːɹdʒɚ sˈaɪz ʌv fˈiːmeɪlz, ɑːɹ ðə pɹˈaɪmɚɹi ˈaʊtwɚd ˌɪndɪkˈeɪʃənz ʌv sˈɛks.
This streak of red is brighter in males than females, which, along with body shape and the slightly larger size of females, are the primary outward indications of sex.