Well, probably you don't get a lot of sex with that female. Is this you? Or your significant other? If it's you, maybe the thing to do is start with an exam and then see a therapist if everything physical is normal. If it's your s.o., suggest she do that. Good luck!
it goes right back to hormonal levels.
there are supplements on the market to help with this matter.
this "person" could also be suffering from psychological problems. unresolved matters can also affect the sex drive. THIS was MY OWN EXPERIENCE.
hope that helps