Free-mixing between the sexes is forbidden, men and women are advised to marry at a young age so that they can fulfill their desires lawfully, and all are told to "lower their gazes" in public so that the eye may not be used as an instrument of Satan.
Source: wiktionary
“They have full 'respect' for nightclubs, nudism, alcohol, pornography, homosexuality, fornication, adultery, interest, free-mixing, music, gambling and freedom to insult the sharia under the pretext of freedom of speech,” the message continued.
Source: wiktionary
You're not going to say it's permissible to free-mix, but this is the society in which you live, so there's bound to be a level of free-mixing— though some of it is needless.
Source: wiktionary
However, school leaders had not taken decisive action following reports from the police in 2013/2014 about extremist views, including one posting stating that any sixth-form students who attended a 'leavers' party' and engaged in 'free-mixing' or 'listening to music' would face 'severe consequences later'.
Source: wiktionary