You shouldn't sleep with different people every week.
Bryan goes to the bar by himself and starts to feel like he needs some company.
Bryan wants to find someone to spend the evening with.
Bryan meets someone at the bar and starts a conversation, finding that they have lots of things in common, and they begin a dating relationship.
Bryan finds a lonely-looking girl and asks her back to his house for the night, only to blow her off in the morning to find someone else next weekend.
Bryan feels less lonely and more like part of a real relationship, the girl he is dating is happy to have someone in her life who cares for her.
Bryan feels empty and alone for the rest of the week and the girl he brought home feels as though she has been treated very poorly.