Hmm.  I didn't realize this one would be so difficult.  Maybe this will help:
   

Shivers?

Yes, it's Shivers!

I would love to see where exactly in the game you found the poster!

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That's not Perfect Tides is it?

The poster is on the wall in the projector room in the theater, Srnickolas.
   

I know your screenshot, but I'm going to give someone else a chance.

Wow, it's luck that I found the game, that was very clever. No it's not Perfect Tides! Nice try my friend

some extra help

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Dang, I wish I could do recovery mode on my brain. I've played Shivers and I kept thinking I'd seen that poster in a quiz somewhere before.

These new screenshots.. are they from Leisure Suit Larry 6: Shape Up or Slip Out! ?

Yes Bob!!! All yours