Sometimes "no" means "yes"?

Is that true sometimes? Some have theorized that women frequently say no to in order to shirk responsibilty for the , to make themselve blamless and innocent. As long as they say "no" it's not their fault. So, under those special cirstance, how should a guy go about telling the difference between yes and no before possibly breaking the law so that everybody ends up happy? Should he just play it safe no matter what and and always consider "no" to mean "no." If you are a woman, have you eve been a part of this sort of interaction and would you be disappointed if men always took "no" to mean "no" and always stopped? What do you guys think?