Should I wear a cup for sparring? I've been getting interested in Karate sparring, but I'm still murky on some things.
Absolutely. There's no reason not to; I've never had it interfere with kicking. I suppose some brands could be disagreeable to your particular anatomy, e.g., I had one once which was too "shallow", so I suspect that if I got kicked there it would have given shock waves through the entire package. If you try one and it's uncomfortable, just buy a different brand.