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→Physical effects: Add citation.
With the [[foreskin]], circumcision removes approximately 70% of the sensitive tissue of the [[penis]], lowering the potential for sexual stimulation accordingly. Due to the loss of around 50% of the entire [[penile skin]], the [[penis]] loses the reserve skin that provides cutaneous mobility in the erect [[penis]] and the [[gliding action]].
In the past, this circumstance was used to make it harder for boys to masturbate and [[masturbation]] less fun, as [[masturbation]] was viewed as immoral and was assumed to cause a variety of mental diseases, caused by the thinking of immoral thoughts! More on that can be found in the chapter "[[Circumcision#Historical_background|Historical background]]". Today, it is known that [[masturbation]] has no negative health effects, but can contribute positively to the child's sexual development. Sexuality is no longer a taboo nowadays, while [[masturbation]] is considered to be a natural part of human sexuality and is no longer seen as immoral. Therefore, circumcision for moral reasons - — which would only affect boys too young to give [[informed consent]] - — is no longer justifiable nowadays.
=== Hygiene reasons ===
* [[Bodily harm]]
* [[Circumcision scar]] is an invariable effect.
* An unavoidable effect of any circumcision is the permanent loss of sexual sensitivity. <ref name="garrett2024-01-09" /> This is partly due to the removal of sensory tissue. The [[foreskin]] contains very many nerve endings and touch receptors, which account for the major part of male sexual sensation. If the [[foreskin]] is removed, they can no longer provide sexual stimulation. It is also partly due to the fact that the surface of the [[Glans penis|glans]] reacts to the missing protection from friction and drying out by developing a callus layer. This reduces the sensitivity of the remaining nerves in the [[Glans penis|glans]] gradually over the years. The study conducted by Sorrells et al.<ref>{{Sorrells etal 2007}}</ref> found a significant reduction of sensitivity to touch for [[circumcised]] compared to [[intact]] [[penis]]es in adult males. Other studies revealed that [[circumcised]] men use condoms significantly less often than [[intact]] men, since they further limit the sexual sensitivity (see above).
* Painful tension can occur when there is too little reserve [[skin]] left to support a full [[erection]]<ref name="taylor1996"/>. This risk is partly dependent on the anatomy of the [[penis]]. While some [[penis]]es already have the majority of their full size when flaccid ([[Flesh Penis]], or "[[shower]]"), others are rather short when flaccid and double or more their size during an [[erection]] ([[Blood Penis]], or "[[grower]]"). Especially in children's circumcision, where the [[penis]] is not yet fully developed, the amount of reserve [[skin]] needed in adulthood cannot be estimated.