Cum rear

From Voyeurweb's Wiki about Sex

cum rear means that a male has ejaculated on (see also: creamed) her ass. A cum rear is usually produced when running the doggy style sex position and then pulling out before ejaculation or the result of butt crack sliding. A cum rear is not likely to happen during anal sex, because there is no need to pull out the penis. Another reason for a cum rear could be, that she owns a sexy ass which caused him to masturbate on her rear.