Quote Originally Posted by doninphxaz View Post
A. If a Russian man is in a restaurant in mixed company, will he feel fine saying «Я иду в туалет» or will he rephrase it with «помыть руке» (or other euphemism)?
Most probably an euphemism will be used. Like "Мне надо выйти."

Quote Originally Posted by doninphxaz View Post
B. If a Russian man is in a restaurant with just his male friends, will he say «Я иду в туалет»?
It depends on the level of formality of the situation, degree of friendship, self-identification etc. and can vary from A. to brutal vulgarity.

Quote Originally Posted by doninphxaz View Post
C. Would a Russian man ever ask his buddy to go to the bathroom with him? That is a situation I can't imagine in the US. No American man will ever (outside of medical emergency) say to his buddy “Do you want to go to the bathroom with me?”
I can't imagine it either. Unless it is a kind of homosexual game which is definitely not welcome in a traditional Russian male company.