The longevity of the game is great. After a quick trip round the clubs you will see thousands of people online at any one time - potentially thousands of dates on offer.
To keep things morally and legally simple, dating and heavy petting is as far as you can go in this game. The AI is pretty smart and if you manage to go out with someone for a dozen or so dates, it will deem that you are going steady. This can feed into how the avatar reacts to other advances and expect a ticking off if you start playing the field.