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1.
A prostitution house where all or most of the whores are male, not neccisarily transsexual or gay, but with most clientel also being male.
A: Did you know about the Mollyhouse that opened up last week?

B: Yeah, wonder if it'll turn out like the Swan

A: Doubt it, no one really cares about it when it happens t guys.
by aniytlia May 09, 2011
 
2.
A type of brothel for gay men, usually appears to be a simple gentlemen's club. aka Gay bar
I thought this was gonna be a good club but it turned out to be a Molly House
by TheNug June 13, 2004