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, 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. One of the first sextoys ever sold was a replica of an erect penis and is called a realistic dildo.