Adding SEX as an exercise!!!!!!

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ok guys, I dont know is this is everyones cup of tea but I think its fair to put down on our exercise diaries Sex as an activity.
I was reading the following http://www.goodtoknow.co.uk/diet/269845/The-great-sex-workout--7-nights-of-sex and then calculated on the following tool http://www.healthstatus.com/calculate/cbc how many calories I burned per minute depending on my weight, and believe me I was surprised!!!!
I think sex should be officially be classified as an* Intensive Cardiovascular Exercise*
What do you think???
:drinker: