Not true for all but true for most.
However let’s make a difference between being close and being intimate; females are usually more intimate than males or at least open up more quickly on personal topics. Gay/bi males are also like this.
As for closeness though, I don’t think there is much of a difference between sex/gender/sexual orientation. I’ve found bros sticking together and backing up each other the same as girls do if not more.
Awww he so coooooote!