Need a .htaccess expert for this one please?

[lux_interior]

I thought I had my .htaccess set up ok and most sites that need blocking are blocked but as many of my sites are Asian content I seem to be a constant target.

Anyway there are a few url's that I can't seem to block and I've no doubt it's an error on my .htaccess. The ones getting through include:

http://www.aladding.com/
http://www.xiaosese.com/
http://photo.aisex.com/
http://xiaosese.com/
http://209.120.238.36/
http://www.xiaosese.net/
http://www.beyond8.com/
http://www.atv8.com/
http://aladding.com/
http://www.919120.com/
http://127.0.0.1-6-fg/
http://atv8.com/

My current .htaccess looks like this:

RewriteEngine on
RewriteOptions inherit
RewriteCond %{HTTP_REFERER} ^.*a4ybbs.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*ourvenus.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*aladding.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*xiaosese.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*aisex.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*beyond8.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*atv8.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*919120.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*hostflofree.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*websamba.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*111-222.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*hylover.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*nudeangel.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*nudeangelbbs.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*amandalist.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^.*chatropolis.*$ [NC]
RewriteRule /* http://www.a-world-of-sex.com/ex/ [R,L]

ErrorDocument 404 http://www.a-world-of-sex.com/ex/

Can anybody suggest what's wrong with it and why the above domain names are still able to hotlink?

Cheers in advance

Lux