Only under extreme conditions.
More seriously - I had one very similar case. Working for Bankers Trust investment bank; whole team went to LA to conference with American cousins. Shared rooms ( gender segregation). Wasn't a preferred thing, but we simply choose a mate/ friend to share with. Bosses got their own rooms. Some pretty big egos there, but it was "whatever - just show me the bonus"
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As another example, international cricketers and Olympic athletes always share rooms.
I'm not sure what the "obvious reason" would be in the OP for always separate rooms in MNC - but it doesn't sound very savoury.