10. Phlox And T'Pol (ENT: Bounty)
If there is a Vulcan onboard, there will be Pon-Farr. This is just another method Star Trek writers use to add a sexy episode to a series. For those that do not know, Pon-Farr is the Vulcan's time of mating which only happens once every seven years. If they do not mate and if they cannot meditate their way out of it then they will die. No Vulcan on a series has been able to successfully meditate their way out of the situation.
In this particular episode, a pathagen in the air of a visited planet caused T'Pol to prematurely enter into Pon-Far. So in ernest was she that she tried to mate with the Doctor. This would have been an incredibly sexy scene if the ridges she carefully rubbed were not Phlox's but someone else's. Still if you like a half-naked T'Pol who is hungry for sex and has no control of her emotions this may be the episode for you.