Different sex positions result in differences in the depth of sexual penetration and the angle of penetration. Many attempts have been made to categorize sex positions. Alfred Kinsey categorized six primary positions. But the number of positions that can be used for sex is essentially limitless. Sex manuals usually present a guide to sex positions.
Some people are limited by physical disabilities in the sex positions which they may use, without pain or other discomfort. Other physical limitations of one or both participants also limit the sex positions which they may adopt. For example, the spoons position is recommended when either partner has back problems; the Starfish position is recommended to easier achieve orgasms and the missionary position may be uncomfortable for the receiving partner if the weight of the inserting partner, relative to the receiving partner's, is a problem. Also, the standing positions may be unsuitable if there is a significant height difference between the participants.
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