My boyfriend just wants to have sex and do nothing else

He pursued me relentlessly — phone calls, flowers, romantic dates — until we had sex. Mission accomplished, he now expects to have sex every time we meet and has lost interest in going out. I feel like I was set up. I am 28-years-old and he is two years older.
Think about why you went out with this guy in the first place. On the initial meeting you found him interesting and probably physically attractive. It seems he was equally attracted to you but only as a sexual partner.