Sooner or later you ought to consider a single sex school as opposed to a traditional coeducational school. Why? For several reasons. First of all, coeducational schools have only become 'traditional' or commonly accepted in the last several decades. Private education has its roots in single sex education, both in this country and in England.
Indeed, if you look at the history of most of the legendary prep schools in America, you are likely to find that they began as a single sex institutions. For example, Phillips Academy Exeter
began as a boys' school. It only began admitting girls in its summer sessions in 1961 which was fifteen years after it dropped the two year Latin requirement - horrible dictu!
It would be another nine years before Exeter admitted girls in its regular sessions.
So, what's really happening here? American private schools like Exeter have always pretty much mirrored the society which they seek to serve. Back in the late 1700's and early 1800's when many of these schools got their start, educating girls was not considered as important as educating boys. Those views changed over the centuries as the young republic grew and matured. So did views about education. In the 1960's and '70's single sex schools gradually fell out of fashion. In order to survive, some boys' and girls' schools merged to form coeducational schools. Others, like Exeter, saw the handwriting on the wall and moved with the times by admitting girls.
In the 21st century the pendulum has begun to swing the other way. Single sex schools are enjoying something of a come-back. Why? Simply because many researchers and educators and parents feel that boys and girls learn differently. To be sure, there are passionately held views on both sides of this argument. But, the reality is that there is room in the world of education for single sex schools.