It will ban those in channels matching certain text. It does a /whois on them to check the channel's. The code is pretty straight forward so you should have no problem modifying it to your needs.

on !1:join:#: {
   .enable #badchankick
  set %whoisnick $nick
  set %whoischan $chan
  whois $nick
}
#badchankick on
raw 319:*: { 
  if *preteen* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *rape* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *slut* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *mastur* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *familysex* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *kidsex* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *childsex* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  if *incest* iswm $1- ban -ku300 %whoischan %whoisnick 2 You are on a forbidden channel.
  unset %whoisnick
  unset %whoischan
  .disable #badchankick
}
#badchankick end