(Warning: slightly NSFW.)
Ah, so that’s what they’re for! I’ve wondered since I first heard about them, as they’re too big for the normally understood use of such things, unless you were planning to use them on a horse. And if you know otherwise, I do not want to know about it. 
I have to admit, it’s an application I’d never have thought of. And apparently a pretty effective one, too.
[...] “Female Adult Home Entertainment Units Turned into Dueling … [...]
If someone gets hurt with these artificial penises, they’ll be getting what’s coming to them. (Or not, as the case may be.)
Skewering opponents with my penetrating wit and towering erections of logic is fun, but I think I should refrain from commenting. It would set a bad example.