I hope this doesn't offend you because I'm not saying it to offend. But I was really tickled when reading about the "Lunging Baby". My LO is 7 months and he does the same thing to me! He has "latched on" to my stomach, other parts of my boob, etc. I'm surprised I haven't gotten a hicky or something from him yet.
He just really goes for it and there's not a lot I can do about it until I finally get my bra down and ready for him. I've tried to not laying him down until it's ready, but he will throw himself down and go for whatever he can. And he's not starving either; my husband thinks he just likes boobies whenever he can get them. Even if he only eats for like 2-5 minutes, he does this at almost every feeding.