no. 1983 for the year 2003 which includes the following:

I request fatwa on the ruling for the mingling that occurs between the sexes in educational institutions, bearing in mind that friendships may sometimes exceed colleagueship.

There is no objection to mingling between males and females in schools, universities or other institutions provided:

• It does not transgress the boundaries of decorum and Islamic teachings.
• Females must dress decently; their clothes should not cling to the body nor be transparent and they should cover the body. Females must also lower their gaze and stay away from being alone with a member of the opposite sex, whatever the reasons.
• Both sexes are required to be mindful of Allah with regards to their eyesight (lowering their gaze), hearing and feelings. Allah said:

Tell the believing men to reduce [some] of their vision and guard their private parts. That is purer for them. Indeed, Allah is acquainted with what they do.
[Qur'an 24:30] 
 
The Ruling
Mingling between the sexes is prohibited if they do not adhere to Islamic teachings and decorum and if it incites desire and leads to prohibitions.