In a crowded place, for men, try and keep your hands up above
waist level, better still fold your arms to your chest. If you find
yourself behind a girl/woman, try to stand side ways or turn around
from her so that your back or bum is facing her.
In the first place, try not to get into a squeezy situation, since
the Law in Singapore only protects the innocence of women while men
are immediately guilty until proven innocent.
It's lopsided.