Deepthroat is a popular escort service when sex-workers are asked to suck dick in full length. As regarding penis size, most of the times, especially in case of bigger phalluses, the cockhead gets into the sex-worker’s throat that causes extra pleasurable sensation on the glans, this is why this service is so popular. Doing a deepthroat is difficult on bigger dicks, and as a result, escorts often have to retch, which also can happen due to bad smell and taste during normal fellatio.