There’s no boundary crossing in a fantasy, and no crime in attraction. So, unless there’s more to this story, and you caught your friend’s dad looking back at you, and you want to pursue it, I don’t see the need in telling your friend. Wlassoff writes in his article “Sex – Is It All In the Brain?” in 2015, “During sexual arousal, our bodies show the same signs as they would in a life-threatening emergency: muscle tension, increased heart rate, blood pressure, and respiration, perspiring, pupillary dilation, and tunnel vision.” This is a physical and chemical thing, and not something you can control, so cut yourself some slack.Īs far as telling your friend, having sexual feelings, and acting on those sexual feelings, are two different things. It’s bound to trigger those chemical reactions in the amygdala, the area of the brain responsible for sexual attraction.

In this example, you happened to see him naked in a setting that can be sexually arousing for a lot of gay man.