Guys do you think of woman badly?

Ok I know dirty girls suck pp and will do it to anybody,, and I know guys will let them and love it then call her names to their boys.... So my question is in a relationship do guys think their girl is nasty if she sucks his if they are commited? I mean guys go dwn on girls and I think it's ok if you are commited to one person and not running around doing it to everybody now that's gross..