I'll give it a go:

• Slower.
  Langsamer.
• Faster.
  Schneller.
• Not that fast.
  Nicht so schnell.
• I don't think that will fit.
  Ich denke nicht das es paßt.
• What are you laughing at?
  Warum lachen Sie?
• Perhaps we can do this again next Tuesday at 17:48?
  Vielleicht können wir es wieder nächsten Dienstag um 17:48 machen?

I like to keep a professional attitude on the set :)

First off, a question to go with other topics of the day, is it actually a common occurrence that E2-ers have sex in Germany? (if so, MA 159 7322)...

Then other useful phrases:

• Umarm mich.
  Hold me in your arms. (approx. Spoon me.)
• Von hinten.
  From behind. (approx. Doggy Style.)
• Beiß' mich
  Bite me.
• Fester.
  Harder. (esp. with biting)
• Leck' mich.
  Lick me.
• Dreh' dich um.
  Turn around.
• Hast du ein Kondom?
  Do you have a condom?
• Scheiße!
  (for when the condom breaks)

I don't know about you all, but I definitely like it un-professional, smile...

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"Im vierlichkei" should be "In Wirklichkeit" = Actually, in reality...And yes, Virginia, one would use "du" barring perhaps masochists.

more to come...