Yes, Eliz, that does seem to be the case, but I think that males can be more emotionally involved than they let on.
I have two sons of 18 & 21 and they are more sensitive that I imagined boys to be when I was a young girl.
My friends indicate similar things about their sons.
I think that females make assumptions that males are able to remain uninvolved and unemotional, and males tend to live up to those assumptions.
Not always, of course.