You might find that your expectations are different, and that may make you rethink things.
From what I've seen, this is one of the rules for a casual relationship that is universal.
If you're not, then it will be problematic, to say the least.
Moreover, if you are trying for a casual relationship, don't romance them. And, above all, understand that they can sleep with whoever else they want and drop you without a moment's notice.
When you're in a relationship, you become a priority for your partner.
When you're in a relationship, you prioritize your partner.
Considering that casual relationships have so little return on investment, it doesn't make sense for you to invest yourself in this person.
So, keep your eye out for others, and prioritize more serious prospects over your casual fling.
Search for causal dating:
Relationships can get sticky, and to a point, all relationships seem to have some kind of drama risk associated with them.