Re: Riker in First Contact (episode, not the film)
After a long exposure to diverse pathogens, he acquired inmunity to a large variety of STD.
Or the standard load of inoculations SF personnel get includes alien STD's.
Rimmer, on what period of history to live in-
“Well, It’d be the 19th century for me, one of Napoleon’s marshals.
The chance to march across Europe with the greatest general of all time and kill Belgians” - (White Hole).