No, I've seen that argument over & over again. And it's a stupid one. It doesn't matter how many cultures any practice is practiced, whether it's healthy or unhealthy, right or wrong, legit or illegit, etc.
The reason why is because in any culture that's large enough, all you have to do is to find one case of it being practiced and presto! before long you get your % up to 78%! (Real impressive). Under such a poor social science junk myth, any deviant sexual practice would qualify as "practiced" in the majority of cultures!
Agreed. Of course, it's your argument. :-)