21, without cheating or anything that involves me having only known it from hearing these things before...
I got 23 but after that I'm stumped -- and this is one of those things that if I get too invested in it I'll spend all damn night trying to figure it out. So, in the words of Forrest Gump, "Jen-nay, I'm sto-opping now".
23 - but I think I just remember a lot from the last time I did it. I googled the answers after I gave up. Some of these most Americans will never get. Like I'm supposed to know the rules of Rugby or Cricket. Pfffft.
There's also a question that refers to Football aka soccer (not American football). I got 25 on my first try, but, like Isabel, it's only because I've done these before.
I think I know the yearly Playboy issue that has the "13 L in a B D", but for most of us foreigners, we'll never know the correct terms. Isabel is right. Cultural stuff. Not r****dED like unodostres says.