Film Classifications; R18

What does R18 mean?

The ‘R18’ category is a special and legally restricted classification primarily for explicit works of consenting sex or strong fetish material involving adults. Films may only be shown to adults in specially licensed cinemas, and video works may be supplied to adults only in licensed sex shops. ‘R18’ videos may not be supplied by mail order.

Who can buy or view an R18?

R18 works are sex works whose primary purpose is sexual arousal or stimulation and which are only allowed to be shown in specially licensed cinemas, or sold in licensed sex shops. They can only be seen by or sold to adults.
For full details of the legal restrictions for these works click on the BBFC Guidelines document below.
When searching the film database, details of R18 works will only appear if you 'enable adult content' using the advanced search option.

Source from: http://www.bbfc.co.uk/what-classification/r18