When fucking someone you calculate the forces involved in each hump in newton's. you can use a=v/t to find acceleration, and f=ma to find the force applied in newton's. This is the only form of sex which involves math and measurement.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.