More and more men are opting for the 90 day relationship. It has a lot of advantages. You get all the fun and excitement of great sex with a new woman, you enjoy discovering someone who is going to treat you well at the outset, you get gifts and favors, etc.
Of course, after 90 days, the woman is going to start making demands. She will start pressing for a relationship, start making changes (or attempting to make changes) in the guys life, laying down ultimatums, etc.
If you are there for the first 90 days and then break it off, you will have a good time and you won't have the usual problems that come with a mature relationship.