Eh one of my worst projects was a one on one with a guy. He never workednon things until the night before, so I ended up doing everything and then last minute before class shifting things around and never any practice for presentations, and then he never understood why my nerves were spastically fried every time I talked to him.

I also knew a lot of female engineering majors who had to work with only guys and got a lot of flack. So really I think it's just... groups.