How often should a couple have sex to have a healthy relationship?

Honey
My boyfriend and I get frisky about every time we see each other, sometimes it may be oral or it may be sex. We only see each other maybe 3-4 times a week? He has school, I have work. What would you say is a healthy amount of sex in a week for a couple? Sometimes I feel like we have sex or oral way to much and it could be possibly all our relationship is based on. I don't want that. Opinions would be awesome:) Please and Thank you!
-Thank You for all the opinions. My boyfriend has told me our relationship isn't based in sex, pretty much everything everyone has commented he has said. I quests I needed reassurance. I worry way to much, again Thank You(:-