I am definitely not a flasher, but at Sandy Hook (our local nude beach) I do enjoy the reactions when I first drop my shorts and begin sunbathing. It doesn't take long for someone to approach me (usually a gay guy) with idle chat, and they stare at it. If I touch it or rub it, they then feel encouraged to stick around and inevitably the discussion turns to talking about how big it is. Every once in a while a girl/woman will be equally aggressive. The older gals who enjoy it come right out an ask for it.
When I go to the nudist camp, there are few gays, but the reaction from the women is pretty consistent. The married women don't look if their husband is around; the younger/middle-aged women can't keep their eyes off it, the married and straight guys just won't look, and older fat and flabby women smile. The few gay guys get hard.