I remember from a documentary on Sierra that Roberta Williams was one of the ladies in the hot tub.

Yes... She's pretty easy to recognize : she's the one on the right.

And the waiter is Ken Williams if I'm not mistaken. Or maybe not. 😀

This game was the inspiration for Leisure Suit Larry In the Land of the Lounge Lizards. The first LSL game is almost a verbatim graphical adaptation of Softporn Adventure, with just a few minor changes.

I thought that Softporn was the precursor of LSL1 was pretty well known, it should be mentioned in any background article of LSL1, but obviously there will always be people hearing about it for the first time.
What I found today is this: http://www.mobygames.com/game/las-vegas__
"Las Vegas", a graphical version of Softporn, available only for some japanese platform.

The game’s cover features three nude women and a male waiter in a hot tub. The hot tub is actually that of Sierra’s owners, Ken and Roberta Williams. From left to right, the first woman is Diane Siegel, On-Line’s production manager. The second is Susan Davis, On-Line’s bookkeeper and the wife of Bob Davis, the creator of Ulysses and the Golden Fleece. The waiter was Rick Chipman, an actual waiter from a local restaurant, The Broken Bit. The woman on the far right is Roberta Williams. The ad was considered somewhat scandalous at the time because of the degree of nudity displayed.

http://obsoletegamer.com/softporn-adventures/

idspispopd wrote:

I thought that Softporn was the precursor of LSL1 was pretty well known, it should be mentioned in any background article of LSL1, but obviously there will always be people hearing about it for the first time.
What I found today is this: http://www.mobygames.com/game/las-vegas__
"Las Vegas", a graphical version of Softporn, available only for some japanese platform.

If you want to be impressed, I have the Atari 400/800 version of Softporn Adventure around here somewhere.