Erection, the double edged sword

Warning: this is sort of an X rated entry to amuse myself so if u are underage plz leave this page..if you are of legal age or underage but feeling rebellious then read on..

I think the most perfect example of a double edged sword is an erection..
If one has an erection in public, with the bulge in the pants, it will seem like a tail is dangling in front of him and people will instantaneously know that the bugger has been having naughty thoughts..
But if one did not have the ability to have an erection at all, oh pity the girl (or guy *gasp*) who will be with the erectionless one..