You know what would happen, especially if men said they were having a blast? Out of pure envy (and what is feminism but envy?) women would claim men are hogging all the fun, and they would want in on Party Town, too. They'd whine about "patriarchy" and "oppression" and "glass ceilings," and follow men straight into the home.
What happens when a kid is playing with a toy? The other kid wants it, too.