Guys, are you trying to scare him away? Are you seriously telling a Tokyo newbie that he's liable to end up in a dumpster, and that he won't get laid unless he's fluent in Nihongo? Nonsense on both.
@Taggz, Tokyo is one of the safest places in the world. No, you won't get fluent in Japanese by watching YouTube. No, it's not necessary. Read through TAG, and you will find many opportunities open to foreigners. Stay away from Roppongi, and you won't get scammed. Hire one of the nice ladies of TAG to show you the ropes, and a good time. Go to Gotanda after 9pm, and you can follow the nice Chinese touts to full service for $100. Walk into any massage place around many train stations, and you'll get a handjob. Use
https://www.purelovers.com/kanto/ and look for what's available to foreigners. I've lived here for more than 10 years, still don't speak enough Japanese to order takeout, I have no problem getting laid, and never have been in a dumpster.