A researcher is interested in the effect of eating breakfast on children's school performance. She finds that children who eat breakfast do better than children who don't. Among children who eat breakfast, those who eat with their parents, do even better in school. Among children who don't eat breakfast, there is no effect of parental contact. There is a strong interaction between sexual orientation and gender in AIDS risk.
Straight women are slightly more at risk than straight men.
Gay men are at much greater risk than gay women. I have noticed that when I am tired or stressed or anxious, I have difficulty remembering the names of people that I am acquainted with. Fortunately, I don't forget the names of people I have close relationships with. When I am not stressed, I still am slightly less likely to remember the name of an acquaintance as opposed to a friend.