This is NOT a normal fan site this site contains adult content and should NOT be The final expansion pack (Due to the release of 'The Sims 2) for the sims.
My Sims 2 sims constantly get naked and have sex in a bunch of ways. . Sexy sims objects (some with animations, requires you to register).
It seems that the modding for sex objects in sims 3 is super low. I would try, but I had the orgy rug for sims 2 and wow it was super awesome.