dinner, movies, bowling, etc., there is a big possibility that they want you to loosen up enough to be open for sex.
This is the most obvious setup, but some dates can progress into the same situation even if it occurs at a coffee shop.
#4 If you met through work, mutual friends or somewhere you frequent. Knowing someone beforehand will give you an idea of how they operate.
Your friends and co-workers will have some insight on whether the person is looking for a relationship or not. The first date will give you the impression you need to determine whether you will end up as a one night stand.
Just know that when alcohol is primarily involved, the possibility of a relationship seems very bleak.