I agree with Lulu, sex in a relationship should only get better. I think a lot people expect sex to get dull and don't do anything about it when it starts to and pretty soon it's...yawn... There are endless ways to do everything, just keep an open mind.
My husband and I have been together for 9 years and I can't wait for him to get home every night. If you can't look forward to being with your partner every night, then why bother being in an adult relationship. There's a rule in our house: Sex at least every 2 days, everyday preferably.

P.S. Some people are just boring in bed. If it's not getting better after the first 2 or 3 times (No one should be judged by the first time!), then it probably won't be very good at all. This is the sad truth unfortunatley.

Of course this is my own personal opinion!