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Ghusal for a man who inserts his private part into another man

Q: 

1. When a man inserts his tip of penis in other man's anus, both should have fard ghusl right?

2. Is the ghusl fard even if when both had worn clothes? E.g. If one had worn pants and the other had also worn pants but the penis went inside the anus along with both pants. Is ghusl still fard?

3. Is the fard ghusl same as ghusl janabah?