Funny i was forced into this situation today with my mother/sister/inlaws and 4 nephews
i told my mother the other day and she didn't quite understood, so started asking what i was doing now today, so a good explanation was an honest one: one of the few things that really make money on the internet and that has the most demand nowadays is adult content, well i run an adult content website and sell services keeping a comission, business as usual. they all where like "ah ok. nice." my wife of course knows, but i have to wait until my 4 yrs old kid understands what i'm doing
he's not allowed to see my monitor anyway