The reason is probolly because of the following factors;
A: Their just to darn busy.
B: Its tireing saveing people all day, how the heck are they saposto have enough energy to do the bad thang
In short: Their to tired to. :)
C: Those who ware full body suits have trouble with the equipment and are afraid of the identy risk.
D: Cant find someone to score with, sad but it happens.
E: Those whome are married, dont have understand other halfs and are in the dog house alot. I mean alot!
F: and lastly, It's to dangerous. example: Cumming Superman and his SuperSpeeding "little supermen".
One word boys, Ouch. :)