I actually thought that was the case as well - sorta like getting a driver's license then getting a motorcycle "endorsement" attached to the license. My dad who was a pilot and air traffic controller in the USAF told me though that you don't need a fixed wing license to fly helicopter - in fact, most places prefer you to NOT have FW experience if you're strictly a heli pilot due to the drastic difference in emergency manuevers and reactions you build by flying FW. Sure enough, I researched it and it's not an FAA requirement, and many places will let you "fly" after about 2 hours of instruction with an instructor. It seems like if nothing else, it would be a pretty fun novelty and maybe a cool hobby (albeit a pretty expensive one).

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2001 X5 4.4i
2002 Honda S2000