the amount of times you and your partner have sex is complete up to you. You could have sex fromthe time you get up in the morning till the time you go to sleep if you wanted to! lol :P
If you want a relationship thats not completely based on sex, you should talk openly with your partner about how you feel, it sounds like you both are in love if you waited 4 months to have sex, my boyfriend and i had sex before we even started dating, and would see each other everyday, then when we started going out we wanted to have an open relationship, not all about sex (cuz thats how it started hee hee)
If you're boyfriend respects and loves you enough, he'll understand.
my boyfriend and i have sex maybe 3 times a week, but everyone's different

hope that was a little help