Ms McAlpine responded: “I thank the Cabinet Secretary for that answer, but I think many people will be shocked to hear it.”
She said research from elsewhere had shown that male offending remained the same even if men self-declare themselves to be women and said criminologists had expressed concerns about “misleading” data.
She said: "The Cabinet Secretary will be aware that offending rates vary significantly according to biological sex, with males accounting for 84 per cent of violent crime and more than 95 per cent of sexual crime.
"Longitudinal studies (carried out) elsewhere suggest male-pattern offending remains the same even if men self-declare themselves to be women. So does the Cabinet Secretary agree with criminologists that it is misleading if data shows a rise in female sex offending, for example, including rape, when these crimes are actually committed by men?”
Mr Yousaf said there was no pattern of men self-identifying as women “to either commit sexual offences or indeed to manipulate statistics”. But he said he was willing to look at the issue in more detail.
“I meet with criminologists on regular occasions and none of them have raised this issue with me," he said. "If we should have an unexpected result, such as a rise in the number of women committing sexual offences, we would of course investigate further."
Richard Garside, director of the Centre for Crime and Justice Studies, said: “I’m glad the justice secretary is open to learning more. It’s really important that crime statistics are based on objective criteria, independent of the persons subjective views and feelings. Classifying according to birth sex, rather than subjective feelings about the self, should therefore be the norm.”