Because they great thing about June, July and August is not simply tanned arms, but as our friend the photograher put it; "Well, that's summer for ya, everyone is happy and horny".
Although there is no valid reason for people to change behaviour, the vast majority seem to be closing up their physical and emotional candy stores as September moves forward. This saddens us. And how exactly do you plan to survive winter then?
Keep the sweetness burning.