It is obligatory to do ghusl following intercourse even if no ejaculation takes place

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Check below answers in case you are looking for other related questions:
Differences between semen (maniy) and urethral fluid (madhiy)
If maniy (semen) is emitted whilst one is awake because of illness, ghusl is not required

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Related Answers:
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Differences between semen (maniy) and urethral fluid (madhiy)
If maniy (semen) is emitted whilst one is awake because of illness, ghusl is not required

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