The Quickie

John and Martha decided that the only way to pull off a Sunday afternoon quickie with their ten year old son in the apartment was to send him out on the balcony and order him to report on all the neighborhood activities.
The boy began his commentary as his parents put their plan into operation. "There's a van selling ice cream," he said. "A yellow car just drove by." A few minutes passed.
"Looks like the Andersons have company," he called out, "Titus' riding a new bike and the Coopers are having sex."
Mom and Dad shot up in bed. "How do you know that?" The startled father asked.
"Their kid is standing out on the balcony too," his son replied.