Some people think this song is about falling in love with a man to the extent of accepting all his darkest side completely, others think it's about falling in love with a married man, others say it is about bondage (sex involving pain and submission), other's think it's an apology of prostitution, others think it is a metaphor for other things... so help yourself and pick up your favourite interpretation but, personally, I think there's enough evidence in the lyrics to say that this song is all against prostitution.

Sexual human trafficking is the practise of deceiving people into leaving their town or country and go to another place with the promise of a good job (or, as on this video, kidnapped), but when they arrive there they become sexual slaves and are forced to practise prostitution. Many of today's prostitutes in developed countries are sexual slaves.

This denounce is not only in the lyrics, but also on the video. The prostitutes (Gaga included, of course) come out of some kind of cryonic capsules in the shape of a coffin labelled "Monster", suggesting death and perversion. One girl with an innocet look is captured by other women and forced to drink something, and then she next appears dressed as a prostitute. She is dancing kind of erotically in front of men who are bidding for her favours. And at the end of the video, the man who managed to take her to bed lies dead, electrocuted, and Gaga's boobs are sending out sparks, so she is the one who killed him as a punishment for trafficking with women. So her sentence "I want your love and all your lovers' revenge" means that I want to have sex with you to avenge all the prostitutes who had sex with you before.

But this man was simply a customer, not part of the sexual mafia, so did he deserve punishment? Well, the idea in this song is that sexual slaves exist because there are men who pay for that, in the same way as drug traffic exists because there are people who buy drugs. So every man who hires the services of a prostitute is a criminal (that's why she says "'cause you're a criminal as long as you're mine", that is, if I'm a prostitute and you have sex with me, you are a criminal).

Other explanatory sentences are, for instance, "I want your love (= sex) / I want it so bad / I don't want to be friends". That means she needs to have sex with him (because she needs the money to pay the sex mafia) but she doesn't want his love or his friendship. She just hates him, so "I want your love and I want your revenge". This is not a love relationship, it's not a good romance; this is a bad romance, the perversion of love, and she's trapped in it (caught in a bad romance) because she has no choice.

Also, the sentence "I want your everything as long as it’s free" probably means "sex can be fine if it's free, but it's a crime if you pay for it" (for the reason mentioned above). Well, you probably know how Lady Gaga is anyway.