So, that's 5 evenings and mornings a week with no sex? What about sex where you come outside her vagina? No one will "smell" semen if you come somewhere else and she swallows it or it goes into a tissue.
I don't think anyone can smell sex on me, ever! We have sex once or twice a day, and like Gunsmoke said, menstrual blood has a heavier odor than sex anyway. She doesn't stay home during her entire week of her period, does she?
I never douche. I don't think it's good for my vaginal flora. If we've really gone at it, and I've taken my shower or bath before sex, then I just use an Eden Wipe, or just a washcloth to freshen up, but if I'm in a hurry, I don't worry about someone smelling it.
And, I'm a nurse and work physically very closely with my patients. I know I don't "smell" after sex. A panty liner or just a quick wipe with a washcloth, no one will notice.