Guys on the right, gals on the left!!

I cannot imagine how ppl will react if the hypermarket or any shopping centres here got different check out lane for different gender (like in Kelantan, they are enforcing this policy now.. ). Let say you go shopping with your bf, does that means when you queue up to pay, your bf have to go somewhere else to wait for you, cos you are queuing up at the female's check out lane?

I really do not understand what is the purpose of this rule, to prevent what? Can anybody tell me ar?