This is an older game (2004), so it was written using an older version of ADRIFT.
After some debugging using the walk-through combined with the sex-scene commands in BBen's readme file I have determined that using the command suggested by the in-game text causes an error, this is because there is a bug in that command when run on recent versions of ADRIFT.(* it wants you to be in both the lounge room and bedroom at the same time, which of course is not possible!)
I got the game to work correctly using v3.9.20 (which I still had installed), though it may also work with v4.0.53 but I don't have that version installed.
Both of these versions are available from the ADRIFT download site