The man proposed "Why aren't virgin men attractive, while virgin women are attractive?"
The man thought the answer for this.
"A virgin woman seems to be safe as if a castle which had never been invaded by a soldier was safe. On the other hand, a virgin man seems to be weak as if a soldier who had never invaded a castle was weak."
I guess the man's comparison is true. So, you may think that I'm weak. But, you have to consider that I live in the world whose security is well maintained. In the world, the war such as castle invasion wouldn't happen. For example, in developed countries, men who has higher academic career are more likely to be promoted than men who has invaded many estates*1.
*1:Indeed, such men can be arrested for trespassing.