What is up with all these girls stopping in the middle of sex then claiming they were raped?

If they are that wishy washy why do they have sex in the first place. I do not unserstand how you can be attracted to someone then all of sudden you are not.
Update: http://answers.yahoo.com/question/index;_ylt=AiKyhvWVJZfpAJwVLvHD7XAjzKIX;_ylv=3?qid=20090514160011AA7MYJe

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Update 2: Ok I understand if a woman says to stop you should stop. If a woman told me to stop I'd stop(many more women out there who wouldn't want to stop ehehe i'm that good... no i'm not). But what I don't understand is why some girls are cannot make up their mind if they want to have sex
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