Should you ask all the time or go by the body language?

Some say you should asked before you done that. Others say that you should tell how much they wanted to do something.

I noticed that some women when they say that when she was shouting or something else , it was only waiting for me to make the sexual move. Though I back off.

Also fear if you getting it wrong.
Should you ask all the time or go by the body language?
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