Should we define the relation before having sex?

He is not ready to define the relationship before sex, he met me only 4 times in 2 years. And expects me to have sex. We were talking since 2 years. I don’t feel secure or comfortable as he is extremely inconsistent. I feel there should be some kind of defination not a committed one before having sex. Am I wrong to want this?
Should we define the relation before having sex?
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