What's Up With That? : Twins

I was just reading (starring, slack-jawed at) a post at The Chive about sexy twins, and it really got me thinking; What's up with the whole sexy twin thing, anyways?

My two biggest concerns:

•  They are related, so you don't really want them to f#ck each other, do you?  'Cause I'm pretty sure that's illegal (in "Blue States"). 

•  Threesomes are neat, but isn't the point that you get two different girls at once?  With twins, you just have to give the same girl double the attention.  

Just something to think about.