I have a bit of trouble in that department as well. Even when I was younger, I had lubrication problems. These days, using a lube is pretty much normal for myself and my . As for desire...I don't really have too much of a problem with it, and usually if I do, it's because of my depression (at least it's something I can blame taking an anti-depressant for, even if I know diabetes can contribute to it as well
).