In an article for The Conversation, he examined all the latest research - and found penetration can last from 33 seconds to 44 minutes when an average is taken of all the times each couple has sex. The average time across different couples was 5.4 minutes.
The Basics of Human Communication. The transactional model is a more realistic representation of human communication. It recognizes that both people involved in the interaction are communicators, and instead of the process illustrated as linear, it becomes circular in its function. Thus the process is an exchange.
Linear model of communication is a simple one way communication model. The message flows in a straight line from sender to the receiver. There is no concept of feedback. The only task that a receiver does here is to receive the message.