Serious Relationships

Tell me, how is it possible to understand at the acquaintance whether we will have a serious relationship or not? Relationships are not a commercial contract where you can prescribe all the mutually beneficial conditions. The very definition of serious relationships definitely reminds me of a straitjacket, into which most people climb to mutually torment each other. The associations with this expression are only one - stereotyped, step-by-step, according to instructions. In short, everything is Serious with us. Sex, love, caresses - only with a serious expression on the face. Something like that? I like another phrase - close relationships. It just reflects what it is worth entering into relationships in principle - knowing yourself and another through intimacy with another.