Sou ka - Is it considered rough male speech?
 

Is sou ka considered to be rough, male speech?

For example:
そう。　　　Sou. - I see. (casual)
そうですか。Sou desu ka. - I see. (polite)
そうか。　　Sou ka. - I see. (casual? rough male speech?)

そう？　　　　Sou? - Is that so? (casual)
そうですか？　Sou desu ka? - Is that so? (polite)
そうか？　　　Sou ka? - Is that so? (casual? rough male speech?)

I ask because I've learned that using か to ask a question without です is typically considered blunt/rough male speech.

Also, what about "sou da"?
For example:
そう。　　　Sou. - So it is. (casual)
そうです。　Sou desu. - So it is (polite)
そうだ。　　Sou da. 　　- So it is (casual? rough male speech?)

Thanks!

>Is sou ka considered to be rough, male speech?

Yes, Generally.

There are two types of "SOUKA". One is acceptive (or self talking) and another is suspecting (or not believing). I'm not sure if it is like the use of "really" in English.

Even girls use "SOUKA" in the acceptive use sometimes. Sometimes girls say "SOKKA" instead of "SOUKA" in accepting use.

>I ask because I've learned that using か to ask a question without です is typically considered blunt/rough male speech.

Yes. Because "DESU" expresses polite mind, conversation will be rough without it.

>そうだ。　　Sou da. 　　- So it is (casual? rough male speech?)
very roughly, it is casual and rugh. But there must be another explanation for it. I can not figure out right now.