See Supreme Court judgment on prosecutrix 

There may be a case where the prosecutrix agrees to have sexual intercourse on account of her love and passion for the accused and not solely on account of the misconception created by accused, or where an accused, on account of circumstances which he could not have foreseen or which were beyond his control, was unable to marry her despite having every intention to do.

As per SC -----If The Promise To Marry Was Not Made With Sole Intention To Seduce A Woman To Indulge In Sex, It Is Not Rape.

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You could find one here.

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In a case like you should first file a petition in the high court. If your case has been dismissed by the hc then you should approach the supreme court.

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There are some latest judgments of the supreme court wherein it has acquitted persons who were accused of rape by the frustrated girl friends.

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There is no dearth for supreme court lawyer, you can find one in the forum too.If you are not satisfied in the list available in this forum you may search for a good lawyer through internet also.

Dear

You should find the judgement related to rape cases in supreme court online to find the advocates who mostly deals in case of rape and consensual sex. As judgements contains the name of advocates. 

1. As per the information mentioned in the present query, makes it clear that you have been looking for a Senior in the Apex court of India. But, still being a junior to a very good senior, i would also like share my views on the issue.
2. It is so common that even after the consensual sex, these types of fake cases being filed.
3. Let me tell you that though the stand which is being taken by the female is on the ground f pretext of marriage.
4. But, they will have to prove that a guy has promised her to marry before having sex, not afterwards.