Most home school kids where I am from still take part in specials (art, music) at school and participate in sports and/or clubs. They are not socially isolated. The parents that isolate their children to the point where they have so few experiences with their peers ARE doing a disservice to their child, but they are probably few and far between. My husband's best friend Jeff was home schooled and he did fantastic in college and has a really successful career now.
As far as the point in this thread, for all though who continue to bring up better test scores I'd like to remind you that the majority of same sex schools are private. Students are accepted based on merit. Even charter schools don't accept everybody and can pick and choose who they educate. This, in combination, with a potentially larger pool of great teachers makes the scores incomparable to other schools.
edited to add - working at FU also gave me some insight and I could clearly see the groups while working at the Rec Plex and eating on campus.
Some boys have great experiences in same sex schools (same with girls) and I don't think they don't have a place in society. But, I still believe its better for kids to be exposed on a day to day basis with their peers of all genders, walks, and persuasions. They will have to do it in the real world. Honestly, think of debates you have in high school that will give you practice for debates in the boardroom later in life. I think the woman who debated in high school with boys and girls is better prepared to handle herself than the woman who debated against only other girls.
And, Cam, no offense, but your experience at Prep seems fantastic - but, its certainly shouldn't be seen as every boy's experience there. My sister's fiance, his 3 best friends, and my brother's best friend all attended Prep and ALL of them say cliques definitely existed, as they did in my high school (F airfield - before the made two of 'em). One of them spent 2 years at prep (freshmen and senior) and 2 years at Trumbull High (sophomore and junior) and he said the cliques, harassment, teasing, etc where comparable at both places. A boys school does not necessarily equal less clique-i-ness.
edited to add - working at FU gave me some insight as well. I worked in the RecPlex, dined on campus, and hung out with a fantastic lady in the mailroom - the cliques were visible to me then, as well.