I'm allergic to citrus fruit, so I struggle... Well, not "officially" allergic, but oranges and lemons bring me out in a rash and make me heave, so we'll call that an... intolerance? Or something...
Anyway! I try to have about 2 pieces of fruit a day, and 3 veggies, I always ALWAYS try and get my 5 a day in... I know what you mean, about wanting to watch the sugar content, but I think so long as it is in moderation, more than one portion is ok. My dad has about 6 or 7 oranges a day, and he's fit as a fiddle..!