To quote the BBFC: The R18 category is a special and legally restricted classification primarily for explicit videos of consenting sex between adults. Such videos may be supplied to adults only in licensed sex shops, of which there are currently about 90 in the UK.
You are filthy. Congratulations!
As a side note, I tripped on the ice in front of my house after an early breakfast and fucked my shoulder up. Should make work fun later today. Special razzberries to my ride, who drove off while I lay dying in the street.