One of the first sextoys ever made was a replica of an erect penis and was called a dildo. Originally dildos were made of rubber, but now they are made from many different materials. Although dildos are not actually designed to be an anal sextoy, they are frequently used for anal sex. ButtBonkers recommends that if you're going to use a dildo anally, be sure to use one that has balls or a suction cup so that it cannot easily "slip in" causing you rectal damage, pain and an embarrassing trip to the emergency room.