I have a friend who has been dating the same girl since high school. Whenever he's on the phone with her, he adopts this voice. The only way I can describe it is "mushy" or "whiny". I mean, I don't understand why he does it. Granted, it's obviously worked for him so far, he's still dating her. But it's weird.
For me, I've always just talked for the conversation. If I enjoy talking to this person, then I don't need to change how I normally talk.
This is an actual conversation: "Hey. Aw what's wrong? Aw... do you want me to come home? Aw... oook... You want me to buy you a hamburger? Aw..." I just don't get how anyone can listen to that let alone say it to somebody else.
I'm not perfect, but I could definitely not do that.