After the party, you should get a datapd near your bed from [spoiler]Mordin[/spoiler] detailing his time on Omega.
The pad basically said he had sex with an Asari. The Asari tried to kill him after it. He bested her with a grenade and she escaped to Afterlife. Here's the kicker:
[spoiler]He says that he "Broke Omega's one rule". Implying he had sex with Aria.[/spoiler]
Holy sh1t.
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Holy shit, way to go Mordin