Answer:
Ils se rasent leurs barbes.
Explanation:
GRAMMAR:
I think "la barbe" is wrong, because this sentence literaly means "A lot of men are shaving ONE barbe".
So, LEURS barbes would be the proper one to say; "Ils se rasent leurs barbes" is the correct one to say.
*** Leur stylo: Two people or more have ONE pen.
***Leurs cafes: Two people or more have THEIR OWN coffees.
VERB:
"Se raser" and "Raser" are not the same thing. Se raser means to shave oneself. It is not to shave the others. But if you say Raser, then you would shave someone else.
Passe compose is something you did BEFORE and finished NOW.