This may be due to reasons such as psychopathy or that they are so attractive that they need not be seen as altruistic.
ðɪs mˈeɪ biː dˈuː tə ɹˈiːzənz sˈʌtʃ ɐz saɪkˈoʊpəθi ɔːɹ ðæt ðeɪ ɑːɹ sˌoʊ ɐtɹˈæktɪv ðæt ðeɪ nˈiːd nˌɑːt biː sˈiːn æz ˌɔːltɹuːˈɪstɪk.