The thing is, this song isn't glorifying a bad relationship- it's recognizing the problem. Lady Gaga wrote many of the 'The Fame Monster' songs while on tour about her paranoia, or 'monsters'- this was about the love monster. She admitted the song was inspired by how relationships usually never work out because they guy isn't good. In the song, she exaggerates the qualities of a bad relationship to point out just how bad it is. In fact, she's almost making fun of the 'lifetime' channel's women stereotype always being drawn to a bad relationship. It's basically all about how it makes no sense for a girl to fall in love with a bad guy but they do it anyways. Subtly, but it's still there.
Watch out for the music video, though. Mother Monster bears a good bit of flesh in some parts and, although it doesn't say it outright, the plot is about the worst kind of 'bad romance', human trafficking.
All in all it's an amazingly catchy tune with Mother's awesome vocals packed in perfect unison, even if there is a bit of swearing. 'Clean' versions have her saying bit instead of the longer word, which she only says 5 times at the end. That version'd be okay for any kid.
And that 'vertigo stick' line is only a sexual reference when you're looking for sexual references. Gaga has said herself, it's another version of psycho, which she says right in the line above it. Where I come from, 'vertigo stick' is slang, meaning a really long, drawn-out session of vertigo.