He prevented ejaculation; does he have to do ghusl?

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Check below answers in case you are looking for other related questions:
If a female has an orgasm without intercourse
Is it obligatory to do ghusl after being manually stimulated?

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Related Answers:
If maniy (semen) is emitted whilst one is awake because of illness, ghusl is not required
She did not know that it was obligatory to do ghusl; does she have to make up the prayers?
Is it necessary to do ghusl after having an ultrasound tube inserted into the vagina?
If a female has an orgasm without intercourse
Is it obligatory to do ghusl after being manually stimulated?

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