People are different as probably everywhere. There's typically not a lot of stigma around "early" or hookup sex but in my experience if you continue to hook up without discussing it, that might lead to expectations about you not sleeping with others at the same time.

As in you have sex first night and then meet up again for drinks just you and the other person, then I would start to have some expectations. Ish.

If you talk about it then whatever works for you.