Pastelike discharge with odor during sex

For the past few months when we are finished having intercourse my fiance's penis is covered in at thick, white, almost paste like discharge. He says that it smells and makes sex unpleasant for him....I cant smell anything, but he swears the odor is there!! He also mentions that it seems like the odor is stronger the more wet I get or when I climax. It is ruining our sex life because he cant' bear the smell........and I don't know what to do because I don't smell anything. The doctor's brush it off as a yeast infection......i take the medicine.......but it doesn't seem to stop the problem.

We do not use condoms and he doesn't pull out...........so i am wondering if his semen is causing some kind of problem which in turn might cause odor.
Anyone have any ideas or have had this happen to them??......I truly am at a loss and starting to wonder how much of the problem is actually me.

Don't have him cum in you any more. I let my boyfriend do that to me a few times and it smelled fishy. I asked him to stop and the smell left. We tried the cuming in me again and the smell came again. We stopped for good and no fishy smell. By the way, I never had a sexually transmitted disease, so that's never been an issue. I think you may have the same thing going on, so I'd suggest that your fiance stop cuming in you; it should do the trick.