"I don't get it; you claim there are two types of [Terrans], male and female. Frankly, you all look alike to me."
"Oh, there's a vas deferens between us," Retief assured him.
By the way, I find your screen name singularly appropriate to this thread.
Cheers!
“Mr. Retief, make her [Retief’s Aide] stop flaunting her chest apendages at me!”
“Mr. Minister, I assure you she isn’t; they flaunt themselves!”