It really doesnt matter what language they speak. The action speaks by itself. I am sure that there are guys who are doing this all over the world. If you ask them I am sure that they will tell you they BOTH enjoy the experience, and that my friends is all you need to know. It is a very basic thing in my opinion. Yo do it because: (a) You can, (b) You want, (c) It makes you feel good, and (d) You trust your partner. So what can be wrong with that?