Hello, my girlfriend has a problem with painful spasms in her lower abdomen during clitoral stimulation. After a while, her clitoris starts to hurt and she gets painful cramps / spasms / contractions in her lower abdomen. 

After that, it is so unpleasant, that she loses interest in continuing sex. Because of that, she has never experienced an orgasm, it starts to cramp and hurt before she can reach it. She is well lubricated, but no matter how gentle is the stimulation or what technique is used (oral sex or by hand), it always starts to hurt.

The contractions in the lower abdomen are the worst. Any idea what to do or try would be greatly appreciated, thanks.