Yes, they still do the urine thing to test for diabetes, although if you go to the doctors, they do it with a blood sample now. I had my army medical yesterday (yes, i get around a bit, i have a lot of different carrers, i think this is the third one i've mentioned on here!) anyway, part of the medical was a urine sample, amongst other things they checked the sugar level to see if it indicated diabetes.
Anyway, onto the subject of the taste of semen. That's not the first time i've heard that, although i think the main one i heard was eating lots of pineapple made it taste sweeter.
I don;t know if it's coincedence or not, but of the guys that i've sucked off, the ones who smoke tend to be less pleasent (I'm not sure whether it was because it was bitter, i'd never really thought about it before). Anyway, my master (who, as i've said before, is away for another 2 months) is about to give up smoking, so when he gets back, i'll compare the tase of his spunk now, and the taste of his spunk then!