Welcome to Dirty Japanese

He Says:
Welcome dirty world of Japanese language!
There are so many hot and dirty Japanese words, shown with the meaning, and some comments, and many variations.
Dirtiest expression will hurt japanese easily, but it can be so cool if you know jp people know.
We Japanese husband and american wife who are a pervert couple present these to you.
There are some dialects in Japan as well, dirtiest one is Osaka(West Japan) one. So we introduce some of them. And it's also so cool to say them to Tokyo people(East Japan).
We are NOT responsible at all you get in trouble using words. Because these words are so dirty, and so impact, make Japanese feel so bad!

She Says:
Welcome! I'm not as convinced as He is that "there are so many hot and dirty Japanese words." After all, I still haven't been able to get anyone to tell me how to say "cock-sucking motherfucker". The words simply don't exist.
However, having lived in Japan for three years, I can understand the desire to want to say things that are unexpected in Japanese. It's fun! Japanese people don't expect you to speak Japanese at all, much less know these kinds of words.
He gives you a warning about using these types of words. In fact, everyone who teaches you the "bad Japanese words" will give you a similar warning. It's as if they're afraid that they'll get in trouble for teaching a foreigner anything that's a little bit "dark" about Japan.
But, I trust that you'll have the good sense not to use these words in front of your future mother-in-law. Aside from that, anyone else is fair game. It's my experience that if you use dirty Japanese language, most people will simply laugh uproariously at the funny foreigner using bad words. If anyone's ever offended, simply pretend that you thought you were saying something else like, "The cherry blossoms are so pretty in the springtime, but their beauty is so fleeting. I suppose such is life."