"Back in my day.."

Seriously, when I was young, women would use douch solutions religiously. However, it has been determined that we were washing out necessary bacteria that kept infection from growing.
Now, douching is frowned upon, even in moderation. As far as semen left in the vagina, her body naturally cleans out the 'foriegn' material.
As long as she bathes, with a little attention spent to the outer area of her vagina, she should have no unpleasant odor. If she is hygiene-conscious and
still has an offensive odor, it indicates a physical problem that should be diagnosed by a medical professional.
For the record, I still use an occassional douch - VERY occassionally - like once every 6 weeks

Don't really know what difference it makes, other than perhaps I anticipate some very heavy oral play with Thorn, and I want to be exceptionally sweet-smelling. He has never said he's ever been turned of by my scent during the other 5 1/2 weeks