Do persons with autism lack interest in sex?

My cousin has autistic sons with co-morbid mental disability. They are in their late teens. Mentally, one is about at a 4 year old level and the other would be about 10. Physically they are grown men, but they have never expressed interest in women or in any kind of sexual activity. When I was that age I was... show more My cousin has autistic sons with co-morbid mental disability. They are in their late teens. Mentally, one is about at a 4 year old level and the other would be about 10.

Physically they are grown men, but they have never expressed interest in women or in any kind of sexual activity.

When I was that age I was thinking about women all the time. I was curious if their condition has anything to do with their lack of interest in these matters.
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