User blog comment:Callummacdonald79/astartes anatomy/@comment-1713318-20130219073205

The Astartes still do have testicles. The reason Loyalist Astartes don't have sexual desires is "simply" because it has been psycho-indoctrinated out of them during their initiation trials.

As for a weak point, sure, its a sensible part of the anatomy, but we're speaking of a genetically enhanced supersoldier who is trained, conditioned and if necessary drugged to be able to ignore the pain and keep on fighting even with a limb ripped off. Not certain a kick to the male parts would have much effect on an Astartes...