It might just be my imagination but I get the feeling there are a lot more Japanese/Korean haafu's in Kansai than elsewhere in Japan. My First Tobita girl was half Korean too. But they mostly only speak Japanese and can't speak any Korean.
1. Calm Down
2. Wait two weeks or until your peepee starts burning or dripping and go get an STD test.
3. Calm Down
4. Wait three months then go get an STD test.
5. Calm Down and don't have unprotected sex with anyone during the testing period.
There's a very pervasive rumour that you can ask for and meet ladies with disabilities on monster street. Spoke with a guy who claimed he was shown women with problems ranging from blindness to actual mental retardation, but I can't say he wasn't full of shit.
Foreigner friendly has never meant "You don't have to speak Japanese."
Not foreigner friendly means you could have citizenship and a PhD in Japanese language studies and they will still tell you to get lost.
Just walk down and when you get waved at by a girl you find hot, walk on up. The names are all on lanterns in Kanji anyway in that overstylized restaurant way that's hard to read.
If I remember correctly (it's been a few years since I've been) it's when she returns after handing the money over. You're kind of expected to already be naked by the time she comes back.