This is why I don't like the fact we cannot upload custom avatars to begin with on this forum. I would like to know why this decision was ever made. Most forums I've been a part of has had that feature enabled for everyone.
If it comes down to moderating the content of said avatars, ... Xenforo supports
Gravatar out of the box, Gravatar uses a rating system.
Code:
g: suitable for display on all websites with any audience type.
pg: may contain rude gestures, provocatively dressed individuals, the lesser swear words, or mild violence.
r: may contain such things as harsh profanity, intense violence, nudity, or hard drug use.
x: may contain hardcore sexual imagery or extremely disturbing violence.
You could just allow only g or pg rated gravatars to be used... It'd help persons like
@Vastet above at least get an avatar, as its based on email address.