As for where girls can't touch casually, it mainly depends on the relationship between your. If you are unfamiliar, you can't do some intimate actions, otherwise you will leave a bad impression on girls and even think that you are taking advantage of others. If you are very familiar with the relationship between men and women, you can touch your head and pull your arm. It doesn't matter if it's a fight, but it should be noted that girls' waist can't be touched, not only the waist, but also very sensitive parts, which can only be touched by close people. If once you become a lover, it will come naturally. As long as both of you are willing, others can't interfere, and there is nothing to say.