Aziz Ansari Is Guilty. Of Not Being a Mind Reader - NYT

[VGPolyglot]

JWeinCom said:

VGPolyglot said:
The easiest way to avoid this is to just ask before doing everything to make sure that the other person is fine with it.

No, the easiest way to avoid this is for the girl to say no or stop when the guy is doing something she doesn't want to do.  

Why should she have to say no first, shouldn't he ask first?