Double dicks are fairly common, but I kind of wish we'd see more double assholes, or double vag. I think it'd work especially well with the the doughnut anuses people like to draw.

What are the logistics of double genitalia? If you got two dicks and you're fucking someone with only one, do both of them shoot when you finish? IF you're penetrating with both, does that mean twice the pleasure and you only last half as long? Same with vag? Would you have two prostates if you had two anuses?

If they WERE separate, that'd either be amazing, or overwhelming depending on your tolerance, because if you built both up, you could either have one insane orgasm or two regular orgasms.

Also, if they were linked, technically you could fuck twice as long since you're not rubbing one raw. Assuming of course that's the only limiting factor.