I Had Unprotected Sex With A Brief Ex About Two

I had unprotected sex with a brief ex about two months ago, I've noticed that my penis smells of her vagina and no matter how much I wash like my life depends on it the smell comes back. The smell usually comes after a couple hours after a shower or when I'm masturbating. I have no visible symptoms of sti's and no problem peeing or discomfort orgasming. How do I get rid of this nostalgic smell?