Oh I see what you mean. Yeah the 2nd one was definitely centered around the idea that you had an actual rival. So you had to work to prevent him from having his way with Tracy and had the option to turn the tables and have your way with his wife.That's exactly what i mean though by more ntrish slant, whether taking another's girl or giving Tracy/lisa up - it felt much more confrontational/underhanded, whereas LWT1 to me felt much more like "feel good time" no matter what the route. The tone in 2 was more "Steal another or get stolen from".
LWT 1 is more laid back and Justin can mostly do whatever he wants although in the original it did seem like Tracy didn't need much prodding to hop on the nearest dick which I found a bit annoying considering how it was pretty much game over if she caught Justin cheating. The new LWT seems much more forgiving when it comes to Justin getting some side action, which to me is an improvement. I do think the story would benefit from having some sort of rival but it doesn't NEED one.