boys "sexy talk"

why why why why why do boys get on the phone with girls & no matter if they like you or not they put on this "sexy voice"! it will go from a high pitch hello to a low "helowww" everytime i get on the phone with a boy that always happens. & it's not because they are tiredd! but please can a boy tell me why ya'll do that? because i find it oh so amusing! but yeah someone tell me why! & why do boys tend to blast music in the background & put you on hold for you [to listen to it] then go & talk to like 30 people in their house and then come back to the phone "my beeeee!" & ask "do you wanna talk to so & so?" nahh i wanna talk to youu! why do boys do this please let me know lmao i'm donee!