Since the slavic languages have the different pronunciantion I suggest to use them for different situations and different spheres of our lives.

E.g. in general, Italian and French are considered the languages for love,
German, because it is so strong and "cutting the words" in pronunciation should fit to army, English to science and along with Italian for singing.

I classified the Slavic langauges for various situations.
Because some Slavic langs have soften or harden pronuciation, more or less soften consonats, more or less melodic intonation etc. I classify them like this :

Czech and former Yugoslav languages for singing as they have very melodic intonation.
Slovak and Russian for loving (talking used during fucking and a flirting) as they are quite soft for this purpose.
Polish for joking (as it has so special intonation and phonemes for this purpose)
Macedonian and Bulgarian for military, justice, police etc. as they are quite hard and strong as they ommit some wovels in words and have something similar to German
Ukrainian and Belorussian should be in culture and art as they have a bit mix of eastern and western pronunciation.

Consider this just as my own differenciation.
If you have other one or any other objections to this classification, write them below.

We Russians consider our language very good for insulting.

Russian as well as slovak is good for girls to talk when fucking.

Agree but we have to make sure there arent to many borrowings in the language we use. For example the Polish language has too much loan words(especially german)-szukac/suchen-wadrowac/wandern-dzekowac/danken-gmina/gemeine-gwalt/gewelt-
cebula/zwiebel....the list is endless..not to mention the the horde of latin borrowings..frekwencia, opinije, pilka...
(I might be wrong in writing some letters, sorry for that.) The Poles should get rid of those words, and words like these surely should be used in a common Slavic language.

Yeah, and Russians have to get from kapusta (Latin "caput") and rediska (Latin "radix").

i Germanski od kren (horseradish), troika, sputnik, peitsche itd.

Hey Eugeniusx, since when you're Slonsak?

since I was made somewhere between Katowice and Oswiecim.

Oh, it means "the one from Śląskie województwo", right?

ya!

And other russian word borrowings : ekipaz', bort, aerodrom, aviacija, germania, etc. etc. etc. There are several hudreds out of slavic borrowings in
russian language.
The same situation is in serbian language.
Basically every slavic language has more or less foreign borrowings.

What do yo want to do with them ?

love Žem
the more languages you speak the more you are humane

to Pan Goethe gvoril

No, it's nonsense. You are human not by knowing languages but by your thinking
and behaving.