well i havn't seen the show and i'm not a parents (and don't plan it ...EVER!) but my cusin who used to be my best friend back when we were "kids" is now a mom.
She and her boyfriend decided to have a baby, she was 19 at the time i'n not sure on his age. She is now 20 and they have a baby girl. I did not aprove of them having a baby not because they were "teenagers" but because they were stupid...ok that rude but she failed her highschool parenting class horibly and he well he was jobless and wanted to buy a brand new mustang before the baby got here, but laughed when i said i wanted a cheaper car saying i could not afford it even though i have a job and no baby

OH! . anyway, it turns out that they are great parents, their baby is very healthy and happy, and they are both working and providing for her.
I still don't like the idea of "teens" having babies but now that i've seen that they can be good parents with my own eyes i'm more open to it. But i do think there should be some sort of madatory course for first time parents no matter how old or young or weather they are adopting or having their own baby/child. of course i also think it should be funded by the goverment....so i'm sure nothing like that will ever happen.
Now as far as watching a show like this being "birth control" i doubt it. In fact i was engaged at the age of 18 he was 16 it didn't work out but as you can guess no one liked it and almost everyone thought it was wrong. But i used to watch a show called "enaged and underaged" on MTV i think, and seeing underage couples getting married and having troubles and having troubles living a "married life" did not phase me one bit, i used to watch it all the time and it never made me think hey maybe i'm doing/wanting the wrong thing.