Homo sapiens reproduction

Sexual maturity

Sexual maturity in humans is the biological, mental, psychological and emotional capability and readiness to reproduce.

Biological

Objections and refutations against them

Biological maturity is not a requirement

ʿAlī al-Ḥusaynī al-Sīstānī is an Iranian-Iraqi Islamic scholar, is one of the most senior scholars of Twelver Shia with the rank of Grand Ayatollah and marja' and has been described as the spiritual leader of Shia Muslims worldwide.

In his treatise on practical law (risālah), he states:

Ruling 2428. If a person marries a non-bālighah (prepubescent) girl, it is unlawful for him to have sexual intercourse with her until she has completed nine lunar years.

Ruling 2528. There is no ʿiddah for a girl who has not completed nine lunar years nor for a postmenopausal woman. This means that even if their husbands have had sexual intercourse with them, they can marry immediately after divorce.

The above two rulings imply that sexual intercourse with a prepubescent girl is permissible.