Another approach is almost the opposite: turn your full attention to the bodily sensations of sexual craving. Observe them,stay with them, breath with them, befriend them. This is known as a 'mindfulness' or 'pure awareness' of what is actually happening in the now. Read this - especially the bit about Buddhism from which mindfulness has emerged as a tool in tackling addiction. It does work because I have used and it really helped.
http://yourbrainonporn.com/top-3-fatal-mistakes-rebooters-make
The other thing I did was read up on YourBrainOn Porn every day for thirty days and I kept a diary. Use what works. You will probably need to use more than one approach anyway.