Why do girls say "don't touch me" or "hands off"?

I've noticed a lot that sometimes girls say don't touch me or hands off.. why do they say that? I know if a guy said that to a girl they might be accused of being gay... I don't get why girls say don't touch me or hands off (btw the girls are single)?

are they trying to play hard to get or something? if so should i, as a guy, try it when a girl tries to hug me or put there hands around my shoulder or something?
Why do girls say "don't touch me" or "hands off"?
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