As you say, in Paris there are different communities of boys and not all of them necessarily hang out.
There are gay establishments aimed more at young "black white Arabs" where you will find boys from the 2nd or 3rd generation descended from immigrants from the French colonies. Boys wandering in the backroom corridors who are not looking for daddies...
Then there are more confidential addresses, small bars where men with less "classical" sexuality meet, naked parties, fist nights... Much fewer blacks, much fewer North Africans... A few young people open to less usual practices... From time to time, that's were I go. I've been with a partner for more than 30 years and when we had long separation I had sex encounters out of our couple.
Should I engage in coitus with an average size black gentlemen? arrival to coitus is the continuation of something which started with kisses, caresses... Every thing can happen if I feel well with the partner!