unless i am completly anormal, man people like me touch themself a lot, and maybe think about everyone they know. Because frankly you get bored to fap at the same image over and over. After some time it dont work.
That said, imagine that one in five person i know fap thinking of everyone that could turn someone on on a island.
If I only take hetero woman i know, [S, V, MM, E] those who are sexually actif will fap thinking of all boy that dont make them trhow up, and ... maybe event the ugly one.
Three of them seam fit. Then i can assume i am in their imagination sometime.