The thing that has the AV folk worried is that in addition to being a mass mailing worm it carries a "bomb" set to execute on the "3d day of each month" and delete a bunch of stuff on infected computers. February 3 will be the first destructive event scheduled since this worm appeared, so it's unknown - until it happens - whether anything really will happen.
With respect to its other "features," it's not really different than the usual run of worms, and any good AV program, with current definitions, should get rid of it. If you update and scan as you should, you probably have no need to be too concerned.
Apparently there are a lot of people into Kama Sutra, since reports on the speed with which the thing is getting passed around is "unusual."