After a long day anybodys genitals are bound to stink, my fiancé has this permanent odor to his as soon as he gets out of the shower the smell is already there.

Like I was saying after a long day of work any genital would smell. Consider what yours might smell like after a long day if you could bend down far enough to smell it. The best way to tell him is to
1. Straight out tell him, "baby what is that smell? It kind of smells like piss, baby did you wipe your peepee (kind of giggling)?
2. If your kinky: baby can you show me or can I help you with that while he is peeing then ask why don’t you wipe afterwards?
Maybe if it is as bad as you say do you see wet spots on his clothing, point that out to him
3. Or get him in the ritual of taking showers after work and have sex in the shower or right after
4. You could also point out that it is unhealthy for you to have foreign urine (not yours) inside of you so he needs to be careful about his hygiene. Make up the fact that you can get an infection, and maybe then he’ll do something about it
i hope I helped some what.
angela