There are colleges that have women-only dorms, but in general, dorms are mixed gender. From there it varies hugely by college, and dorms within any given college. Some alternate gender by floor or wing, others don’t. Some have single gender bathrooms, and others don’t. Suite dorms (where a group of bedrooms share a central living space and have their own bathrooms) are typically mixed gender dorms but single gender suites- but there are colleges with mixed-gender suites.