50 foot rule
''The 50 foot'' rule pertains to the distance a male is from a female before he can make an accurate assessment of her appearance. If she is seen from beyond "50 feet" then she is too far away for him to judge clearly if she is worth pursuing.
Male 1. "Man did you check out that girl? She was killer!" Male 2. "No man, did you use the 50 foot rule? No! Well then, you don't if she was banging or leading the cougar line. Don't waste your time."