You actually can buy those kinds of drinks at a convenience store in Japan. The problem is either with the translation or her understanding that those drinks don't automatically equate to something for sex.This is the person who started a fight with someone on the internet, and actually showed up.
Whilst being a tiny girl.
I don't think she's on speaking terms with critical thinking.
But yes, you can buy those stamina drinks in glass bottles in any convenience store in Japan. And yes, a lot of people use them as quick energy to "improve" their sex. But a lot of people also use them like five hour energy shots.