score:4
Are you asking about a tradition or a community? If the latter, there are many. Most of the "insight meditation" communities, e.g. IRC, Spirit Rock, IMS etc in the US are sex- unsegregated. But if you ask about the Theravada tradition that these communities trace their lineage to, usually in the original country (MMY, SLK, THA etc), there is a separation in the seating in the meditation hall.
However, there are many religious activities that are not segregated - families often do them together - e.g., food donation and other donation at monasteries, meeting monks for advice or to pay respects and volunteer work of various sorts.
Upvote:4
Our branch of Rinzai Zen has no gender division other than that we segregate by sex when bunking up for sesshin. I canβt think of too many Buddhist communities in the US that would even consider that, quite frankly. I think the group youβre with would be the exception in the West, at least.