#schools

My teen doesn't want to have friends over. Is this normal? Also, is there a benefit to an all boys school for my teen?

My older one is 13, all honor classes and smart. He is very athletic and social but he does not like to have friends over. He had several play dates in our house before but lately (besides the amount of hw he gets) he is not interested in having over neither his school friends or soccer friends from the club he has been at for the last 5 years. Should I be concerned?
Also, is there a benefit to an all boys school?