I'm looking for something serious but I'm ok with casual too.

Before I have a date, I always try to know if she's looking for something casual or more serious just to know how to escalate, if she wants something serious, I will naturally escalate slower and only try to kiss her if she escalates it too.

To know that I usually like to try sexualizing the conversation a little bit to see her response. For example, if we are talking about something about my face, I will say, "If you deserve, maybe you will see that closer when we are together", but it's not always possible to do that.

What do you usually do to know that?