Do you behave differently in mixed groups compared to male only groups?

I voted “no”, but “ADBOC”/“it depends” would be more accurate. The male-only groups I'm likely to be found in are usually unusual in ways other than the absence of women, and for any two groups A and B such that A is a subset of B, A doesn't contain women, and I'm non-negligibly likely to be in either of them, there's no substantial difference between the way I behave in A and the way I behave in B.