Reports state that the woman stabbed him after he tried to force her to have sex.
The incident happened on Saturday August 22nd just after 2am in the town of Mislata in Valencia.
Police were called by passersby who found the boyfriend lying in a pool of blood holding his testicles.
The girlfriend told police she was angered after he forced sex on her and when she said no he slapped a condom across her face.
She was subsequently arrested on assault charges by Valencian Community police.
The police said she has been released on bail to an address away from the man who is said to be recovering.
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