There are so many cultures around the world!
There are many muslims who do not practice their religion completely, therefore they do so many things those are prohibited by their religion, like drinking and open dating...
But there are also simple guidelines for a muslim to take care of both, his/her religion and fantasies...
For example, if a muslim guy dates a girl, he should make a kind of temporary marriage with her, for a certain time and a certain gift, based on their agreement. This marriage is not official, but only is done with some phrases between the guy and the girl showing that they confirm their relationship.
This is very simple, so do not get surprised if you were requested such words by a muslim guy in your first date!
