My boyfriend has a very strong musky weird smell coming from his penis what is it? do he have a disease that's why he smell.

Might be normal: Most males have a musky smell normally due to their body chemistry. Generally females have a much keener sense of smell than males do so they notice the smell more. It may be just a simple solution as that he needs to have better hygiene. At least one or two showers a day, maybe more and especially before any intimacy. If you don't think this will help, then have him checked for infections.