Do guys usually ask women to be their girlfriends, or do they just go on dates and assume that they're automatically in relationships?

Are there things that guys do to express their desire for being in relationships with women? I've heard guys give flowers to ask if women wanted to be their girlfriends, but is that common, or old school?

Or do people just go on a few dates and assume that they're automatically in relationships, meaning guys would start putting their hands on women's hips, etc. all without asking.
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I prefer clear communication, but I don't want to tell a guy that he needs to let me know when it's time for us to commit in the relationship if he's not even thinking of that yet, since I'm okay with longer dating phase and not jump into a relationship just to be in one. It's just that certain things I'll only do with my boyfriend so I do need a guy to express it clearly if we're a couple or not.
Do guys usually ask women to be their girlfriends, or do they just go on dates and assume that they're automatically in relationships?
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